Thanks - I don't think it's that difficult, I think anyone can. If something's wrong, you just rub it out and try again - it's often hard to spot what's wrong, but that's just practice. A drawing a day (which I've been slacking on recently) will sort out the practice.
Thankyou for the kind words. You know any devArtist is going to say "it looks better in real life" I think real life looks pretty much like the photo, but it was a horrible photo to start with and there's a lot of "jpeggyness" on the full view.