I think this set is already very good as it is, but I honestly have to agree with REEK that it would look even better if her abdomen can glow blue for her ultimate as well here.
Here's his original comment if you wanna see it also: "can u make her butt glow blue like frost instead red? that will be epic! this set actually wanna make me play this hero"

Another person also mentioned that it would also look good with more frosty-looking webs, so if possible, I think it would be nice to add that as well, though just making the ultimate glow blue instead of red when this set is equipped is good enough for me here.

Hope you like these ideas also and can add them to this set soon enough here, cause I think this is gonna be one of the best sets for Broodmother if you can do all that here!