A few criticisms I have, though I am a little unfamiliar with older Maplestory:
You depicted Orbis as many small islands surrounding one large island, but in game, the only other floating island nearby is Chryse. Also, based on the scale, you depicted Omega Sector as the size of a continent, rather than the small island that it is. Also, all the bricks in the foreground are 4 pegs long, and line up at the edge, but are somehow staggered, which means the pegs are different sizes, and are impossible to build with. The castle in the background seems to be the Lion King's Castle, but its structure appears to be more similar to the Chiefs' House in El Nath, with its vertical form, overhangs, and stilts. The Lion King' Castle is far more flat and spread out, with no overhangs. It is also situated in the Dead Mine, which is a valley location, not a mountain top. I must admit, however, that you're a far better artist than I am. If I were to draw this, it would look like a preschooler's art.