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I can think of 3
One is the typical graylien design
The ugly nasty looking type
And lastly, aliens that look similar to humans but have distinctive features
I would assume alien life forms would look different to Earth's life forms - Discovery channel had a good series which pictured such "alien life" like flying whales, giant carnivorous mushrooms and such.
But it's all Sci-Fi fantasy since we don't know about alien life forms even in our solar system, much less other systems and galaxies.
It is only random chances of fate, environmental shapings, and random evolution that stopped our world from being octopods, crabs, dolphins, spiders, or who knows what.
If you took a planet with an identical composition, mass, orbit from the sun, and sun, it is still going to have a completely different genetic soup, astronomical events, planetary events, and gene dead-end cycles.
They could be blobs, or hive mind bacterial colonies, or sentient singing flora. It is infinitely more likely that anything out there will be so far out in left field we won't have a baseline for comparison to life here. We.might not even recognize it as life. How would a silicate lifeform be understood by us as life? Or a complex hydrogen/cold fusion invisible miasma?
And communication would be neigh impossible. Even if they are perfect copies of us, their entire linguistic history is different. Now how do you communicate with something that uses complex helium chains as talking, or E.M. waves, or an hour long song of radio frequencies with radiation bursts for inflection.
You want to know what comes to mind when I contemplate alien form? The living gas giant collective from Star Control 2. Or the telepathic communication blobs the Ur Quan use from the same game.
First, there's no proof that there are any... That's an upopular opinion, of course. But, while the probability is very likely to be positive if one assumes certain conditions exist, even such an estimate can't yet be proven to be a valid one. We just "don't know." We "assume." But, assumptions are exactly what they say they are.
Looks likes:
For one, bilateral symmetry seems to be really popular among multicellular species and in all biomes on Earth. It's not universal, here, but it does seem to be the dominant theme. And, there are sensible reasons for that since if one loses a hand, one can still have one left. Good idea, Nature. Got an extra liver for me? No? WTF?
Sensory organs are important, it seems. So, there'd likely be some. But, they'd be tuned for the environment they evolved in. In some cases they could have been altered due to preference or even due to "culture." That's a thing, too, so additional sensory apparatuses'ses may be being used that are indistinguishable from natural forms.
Keep in mind that an advanced alien species capable of interstellar travel would likely look like they actually wanted to look like, too. So, if they like lighting trashcans on fire and wearing them on their head, that's what you're going to see. Provided, of course, they don't realize that they may frighten less advanced species who have yet to witness the stylish glory of trashcanheadfires.
It's even possible they may wish to assume a human form simply because they believe that's the best choice in an observation or "First Contact" situation, like "Starman." Yup, they could all look like Jeff Bridges.
There's a natural assumption that is made that, no matter their appearance, there'd be a need for it to be somehow judged by "Evolution" to be efficient. That is untrue. Evolution doesn't care about efficiency. It only cares about whether or not a species can survive to reproduce. If it looks like a busted-up starfish and has perpetual asthma, but multiplies at an astounding rate, Evolution doesn't really care about whether or not other things are very efficient. It'd be sensible, of course, but other conditions can easily manage to control for those things. Corrective shoes, for instance - lots of them. All that matters ishow quickly and easily it can get the chance to bonk and for those bonks to be fruitful. (Transmission of genetic recombinant material carrying critical information a must, though.)
Edit: Missed a spot - Intelligence: They don't have to be particularly brilliant. All they have to do is to be able to get here for us to see them. So, yeah, they could have invented interstellar travel long ago and just evolved to the point where technology never placed any further demands on their intelligence, since it did... everything for them. They may have once been smart, but now Wall-E needs to rescue them.
So, yeah, functional idiots that looked like lopsided badger-starfish-dumpster-fire Jeff Bridges could exist and be on their way, right now... Do you know where your towel is?
All I can say is that I would have high doubts that any "alien" species that evolved from a different source and in a different environment than humanity could naturally look human. Wildly different? Possible. Wildly similar? Possible. Any sort of them existing at all? Dunno, yet.
It's interesting that pretty much all planets in our solar systems are different to each other, with different conditions, climates, atmospheres, etc.
If there was to be a duplicate of Earth in some solar system out there (image a two-star solar system) with good conditions for life, maybe it would support some similar life forms than Earth does, but they'd most certainly be evolved differently.
I would say there's a good chance that our solar system supports life forms outside of Earth, but they're probably more on the primitive side - some sort of algae like beings in the frozen oceans of Europa moon maybe.
How they're dead then?
I don't... just like I don't imagine Bigfoot, the Loch Ness Monster, the Tooth Fairy... etc.
I Googled this but apparently there are an estimated 21,600,000,000,000,000,000,000,000 planets in the Universe.
So considerably more than just a bit over a million.
Also
"It is estimated that the universe contains between 30 and 70 billion trillion stars. Our own galaxy contains 200-400 billion stars."
Space is unimaginably huge.