Ahh I really like your referenced digital paintings!
The only thing I could really give you advice on since you're already so great...would be to take some artistic freedom and maybe make the values more drastic er...pop more? Right now the paintings look like referenced paintings and not really creative if that makes sense? Study wise, sticking to the reference is great-really great to hone skills on faces and the like, but what I guess I'm trying to say is that you have to take it a step further if you want your own artistic flair to really show in the piece ^^
Well, we all get better somehow.......right?