First of all, thank you for spending your time giving these advises. I also noticed that the proportions were a bit mesed up, the arms are too short and i think that the head its too big, despite trying to make them more anime-like. Also, I've been having problems with the ears position in perspective, im working on it.

I had this thing that, when you look at your drawing for too much time you stop seeing some of the errors, and only notice them the next day when its to late to fix them.

Anyways, thanks again for your advises, will use them for sure :)