... Update: personally I've often had a problem with art which had several strong colors in one picture. Many people love that, of course.
Looking at Peter's art page, though, he also has some work which I think is really good, like this one.
And he does combine photos and digital art very well. One of the things I dreamed about before I got a computer was doing just that. In the imagination it seems very easy, but in practice it is just absurdly difficult, because the two things just don't want to integrate.