Hi,
your portfolio has more game graphic assets, sprites, from what I saw on Behance...that's very game oriented....
Unfortunately that is not the style that is easy to sell on microstock companies.

IN microstock anything can sell, but most buyers are using a different style of illustration on advertisign campaigns, webdesign, print design, editorial, magazines, brochures etc...

I think your sprites could sell in markets where you find people developing games...Gamesalad used to have a marketplace to sell your type of work, google that and see if they still allow users to sell their graphics....They have a forum, look for the thread "art wanted", where a lot of indie developers are looking for graphics for their games.