The change in the background makes the level look much better, but others have said this, and I'll say it again: The level looks too flat. And most of the parts I see in this level I recognize from the original game. Let's look at those few parts, shall we?
Okay, I may be a little picky on this one, but this looks like the slope that led to a banzai bill. Not sure how else to describe it, so yeah. Oh, did I mention there's a banzai bill right after that slope?
This is just straight up those four blocks from the original level. Change/Delete them.
That 3-up moon is also unchanged. There's really no reason for it to be there. Also the shell and message box are in the exact same position, as well as the platform there. It looks like you just took it and replaced it with the clouds that were originally there.
Did you even try here? It's exactly the same from the original game, the same blue pipe with the blocks, same exit(even with the lack of the slanted pipe) and same checkpoint placement...
Looks... so... familiar...
I feel the amount of banzai bills here is unnecessary. After all, you go up on a platform right before it, so what's the point? Also, platform that has a yoshi coin in it looks like the one from the original game. Also, you didn't seem to do anything with the clapping chuck.
... Yeah, just a bad blatant 105 edit. You should just make levels from scratch by pressing Ctrl+Del. This will delete everything in the level.