Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
Hmm... based on your art, I'm trying to incorporate that into an ExGFX file. Not sure if I can do it. I'll inform you.
Edit: The eyes are done. Is it safe to overwrite the big boo tiles?
The mouths are done, too. Now for the body. I hope I can do it. I hope the coder can use what I drew.