When you have something to show - post it for critique
A very good idea, especially critique of technical (Photoshop) issues. However, don't let anyone discourage you if their aesthetics happen to differ from your own and they push their trip too hard and also realize that flames coming your way reflect far far more poorly on the flamer than the flamee. I speak as an extremely experienced "flamee" and I'm nevertheless still unburned and very enthused and confident about my work.
Just do it, and have fun, and above all, trust yourself.