Well, if your interested in revising it, try adding more screenshots on the back. Keep your Spine logo like the original (3d style) or add a drop shadow or something to give a bit of depth. Also consider changing your "Super" to RED - the blue is a bit hard to distinguish.
The Front - try removing the BLUE bar on the top and slide the image up to fill that void (keep the logo where it is (it will stick out of the image now.) simply add your SNK logo on the top left corner of the image. (check that out see what it looks like.) The front is cool as-is though man.
Interested in keeping with the Genre Code? If you notice that a lot of the games have different color schemes/stripes on the inserts at crazearcade/ classic-shock. Big Bear mentioned that he will use whatever looks good but I'm keeping to a color-coded system for the games.
Since this title is considered "Sports" then your color-code would be green (take a look at some of the sports titles (Neo Turf masters, Super Side 3, Stakes Winner 2, etc. ) Ofcourse there is no rule to this, its just yet another way to distinguish your MVS titles from one another as they are displayed. SNK was not consistent with this. I keep my titles together by genre so I will continue to color-code them accordingly.
Good work though, keep it up. The more you do, the less I worry about!
that is really good looking. nice job