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I think the reason it looks flat is because there is no reflection or gloss on the original image (i.e., the white portions that we're trying to color). If you open the Info panel and move your cursor over the white areas, it is all blown-out... everything reads as pure white with almost no variation. So the flatness is already there and it just becomes more noticeable with the blue coloring.

One possible solution: if you go to Filter>Render>Lighting Effects there appears to be a way to simulate gloss and reflections. (I've never used it before. I just tried for 30 seconds and couldn't get it to do anything.) Possibly you can read-up on that filter, or maybe somebody here is knowledgeable about it.