Thanks guys. The feedback means a lot.
As for the hand, I think it took 5 or so attempts before I got this. It was either too thin, too short, too long, the fingers were too fat, etc, etc.
In the end, I figured it would be best to go with this one otherwise there would be so many old outlines there that colouring would be a pain. I always thought it was kind of strange, you'd think she was giving the horns to someone.
Though I have a lot of work to do before I get better, I'm glad the proportions of what I've done so far have turned out as they have. It was one of my biggest worries. And the faces don't seem to be such a problem either, though the eyes ended up looking up instead of forward. I think that was a mis-calculation on my part. At least now there are 2 pieces of Amy fanart in the gallery here.
But anyway, courtesy of Lyla I now have a link to some tutorials. I'm going to go take some time and just do some practice stuff today and think about what I'm going to draw next. At least now I know my old scanner can actually do a decent job, I'll be uploading more as time goes on.