To be honest - my modelling skills are non-existent.
I'm working with the original models from the games, pose them and render them in Blender Cycles. The rest is photoshop - lots of it.
I'm actually doing this 3D-stuff since nearly six years now, so I went through a lot phases of trial and error to come to the point I am standing now. What kind of advice I would give? Don't give up - believe in yourself and don't let yourself be intimidated by other artists. Take them as inspiration and always remember that they started as beginners once too.