for some reason, you think that most of your levels in the trash can subforum are shit. Well, if you want to know how to improve your skills, just follow this tip.
first, use many random tiles from any tileset in this level, because nobody ever does that, but you must do it since it improves the design more and more. Remember to not fill the whole screen, as it will become impossible to beat (unless you use one of these legendery smbx cheatcodes).
Second, decoration - place any background object whatever you want, especally if thebut remember - it must be beautiful!
And the last, NPC placement. place many NPC as many as you want so the level can have some awesome action ever.
mixed styles can also make your level beautiful unlike SMM which is limited as shit