Is this acceptable? (Mario 3-style enemies)

[Ton]

Bump this when you've made the edits. I think this is a great start. The forward-facing Koopas look good, as do a lot of the SML enemies you edited.

I'm going to suggest adding more. Maybe a larger Chain Chomp, some SML2 Cannon Pigs, Shyguys based on Yoshi's Island, maybe an extended Pidgit Bill... There are a lot of options.

As far as improvement,s anything with an "effect" could use work, like Bob-Omb's flame or Sparky's well, sparks. The spiky Cheep-Cheep could use some refining on the spikes, too. Hoopstar's spots look almost invisible.

There's probably more, but there's a start.