In order for us to use them you need to supply us with the Zip files (I use Dropbox for the purpose).
Also - and I learned this from experience - Bezel lovers like to have original artwork combined with custom art in the same Zip.
For example - Alien Syndrome already has "official" artwork. If you give us your Zip, then copying it to Mame would over-write the official artwork, and it would be lost. Instead create a single Zip, containing both the original art and your own. Job done!
I have created a few Bezels, but totally lack any artwork skills - some of yours look as though you're creating some artwork yourself, which makes them that bit extra special.