Carapace form Epic could help http://epicgames.com/community/2012/11/free-art-tool-released-thanks-to-epic-friday/ I think experience is what makes you better in this stuff. Drawing for example isn't putting marks on a paper. It's knowing where to put them. Observation is way more important skill than making marks on the…
No one can really help you refine your critical comparison skills like practice can, it just takes time. There isn't some tricky trick or magic formula that will make it all snap into place. I can point things out that don't fit right but then you're just relying on the skills that I've developed and not fostering your…