Nightlancer Assassin

The artwork looks very promising and the theme is appealing, but personally I would like more contrast between foreground and background. Try reducing the image so it literally is thumbnail size, with your thumb at arms distance, and then assess the card as a whole. It is hard to make out the figure at true thumbnail size. Keeping the figure dark and crisp and letting the background go paler and with some of the contrast washed out would make the foreground/background distinction more apparent. At the moment, the artist is mostly relying on blurring the background, which I feel is not quite enough.

Of course, preferences like that are very subjective, so others may disagree.