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Your painting is for sure great! Very smooth and precise.But, I still think that the whole picture looks blue, rather than just the background. In some cameras the white balance has to be changed manually, try and take a picture of a pure white surface, and if it turns out blue, you'll have to change these settings. I hope this is helpful and that you don't see it as critique, I had this problem myself for a long time with my new camera before a friend told me what was the problem.
that looks top class mate.Can you photo the model on a white B/G?Your first two images look blue tinted and the 3rd is blurred , sorry , the model looks so good i had to ask for a new pic !