Hmm. I don't know what to make of this one. It's very detailed, but there's no real focus anywhere. Every single line is the same thickness, and there is little variation in the blue shading as well, so looking at it from far away (or in preview size) everything just seems to blend together into an unfocused and blurry mess, and it just looks very flat.

I'd try to add more variation to the lines, thicker lines in dark areas and thinner ones in highlighted areas, to add a sense of depth to the piece.