To be quite honest, I agree with Arantor regarding the empty space. While it's possibly the cleanest theme I have ever seen (and gets my congratulations just because of that), it seems very empty. Another issue is that it needs a bit more colour.
Blue, white and black is quite overdone. I haven't really been a fan of mixing oranges with whites and blacks like you've done in the past, but I feel this design really needs another colour in there, but it needs to be subtle, like a reflection or inner glow or even just a border - just to give it some life. Any colour as long as it looks appealing. Maybe a brown? Or a pink? ...Actually, maroon would look pretty decent in that design.