1) Ridiculously cute. (^_^)
2) I know there are matte label sheets that you can print normally, but I don't personally know of any good way to print glossy stickers. (There may be one, I just don't know of it.)
3) Fair warning, "lamilabels" (stickyback laminations) aren't a good alternative for making glossy stickers - they're expensive, don't look good or hold up well, and you'd have a heck of a time doing fine trim-out work for details like the feet.
4) If you do keychains by laminating prints, make sure to leave some space when you're trimming. Trimming to bleed means the two sides will peel away from each other a lot more easily.
5) Good luck with this, and I hope this gets to the point where you have finished product to sell. (But if it does, then those posts would need to go to Swap Meet.)