Welcome thecpoc. Your cover looks great! Thank you for the kind prase for the discriptions. Here are just some things I would suggest to impove:
Rating system: If I recall correctly, the ESRB rating system didn't exist until after 1993, so relitively few NES games were rated at all. Keeping that in mind, as a purist I don't like to see ratings for games that never were originally rated. If you remove it, it would enhance your cover. Just my two cents though, opinions will vary.
Consistancy: at the very bottom you have Capcom's copywright info that looks pasted from the old cover. You might want to rewrite that to improve the overall finished version.
I really like it though, I think I might actually print it out and replace it with the one I use. I hope you do covers for the other five NES MM titles as well. Your cover looks great. If you're doing to do that though, please keep in mind that they'll all be side-by-side, so make sure the spines match up like what lumberjack masterfully did.