I really like some of the things in your portfolio. I especially like the colorful bottles, and tubes, and gems.
You should consider putting more of your work up on the Envato network. You have hundreds of items up at Dollar Picture Club, but only a handful on your Envato account. Your Envato account also only has individual items, like one football helmet, or one motorcycle. Your portfolios on other sites have collections of multiple items. At Dollar Picture Club, I can purchase nine football helmets from you in a single transaction for $1; on Envato, I would have to make nine separate purchases at $5 each to get those same helmets.
It's not just about the price. Everything I see in your portfolio is worth way more than $1. I buy a lot of stuff from the Envato network, though, and I already have accounts and credits, there. If you had the same selection up on the Envato network as you do on Dollar Picture Club and some of the other sites, I'd definitely buy one or two items.