I know that this one looks better in real life than in the pic. Couple of suggestions: use a different color background. Everything I've heard suggest a sky blue. And maybe tweak a little in a photo program to get the pic a little lighter. I've found that I have a hard time photographing and having the pic look like real life. I can get close, with a tweak here and there to get it better.
The Photography is perfect! As for the painting I really like the horse and the base and mostof the rider. I would have done some more extreme highlights on the armour it looks a bit flat. Nicely painted though