the collections are set up by how popular a subject is, if you have that subject, if the staff likes your work and if you sell well. i think i'm in 3-4 of them. but... i really consider the collections more of a dead end for the site and not a big help. they won't help you sell, especially after a buyer learns that there is a limited selection of things in there. once they know that, they will ignore the collections whether your in them or not.
best to simply market off the site. the site, buyers etc, probably don't care about the artists achievements anyway.
i do have a few suggestions though for your bio:
1. you mention the watermark - but nothing is watermarked.
2. you threaten the buyers by telling them not to steal your work. that is not needed, and i'd probably just go to another store if i saw that.
---Mike Savad
MikeSavad.com