Incredible, and very minor details, of course, but thats being picky Donna's face isn't quite right and Jenny's face isn't that taut and you have ages the Doctor by about 10 years but apart from that, brill! xD
Wow--excellent likenesses of the characters. Good "Gallifreyan symbol" background. Carefully and skillfully painted. Two of the best likenesses of Tennant and Catherine Tate that I have seen. Good texture and lighting on the Sontaran and Davros, especially. Very nice job overalll!!!