Nice shot, but it needs to be larger to be seen. While the full 640 pixels allowed won't fit on some screens for a vertical shot, you should try to fill the vertical distance on the screen. My monitor works best at 640 wide for horizontal shots and about 520 deep (maybe 280 to 300 wide plus or minus) for verticals.
I am sure everyone here has already told you "too small". Happens to a lot, time to learn resizing for DP methods. =) Check the forums, all over the forums.