Heheh, I'd've never guessed that was Eggman if you didn't say anything. I like how all your drawings seem to have a shady sort of air. The Sonic one looks like a render I've seen before, though. I know that pose came from somewhere.
I can't make heads or tails yet of drawing things based on anime anatomy, in that I'm dreadful at it (unless it's of animals or alien creatures), so I can't really add anything on that front. It's easier for me to comprehend a western approach.
I like the fact that you can mod at all. I don't know how difficult something like that is, but I'm sure it takes some work, more than I think people give credit towards. I liked the first video Green Grove Galaxy, too. I think the intro was sort of atmospheric, and maybe a little funny with Luigi just hanging around.