I'm glad you enjoy them!
I put the art together, but I didn't draw it. The turtles on the Toon Cycle was its own piece of obscure promotional art that I cut & pasted onto an original hand-painted background from the OT. I did various Photoshop sorta things to neaten them up, color fixes & smoothing out details, etc. but putting the two together & adding text was about all there was to it.
I did not notice that error with Donnie's bandana, thanks for pointing that out. I forgot to erase the background from behind him right there.