Mixed skillsets are a good thing, as long as you are proficient in this mix. It increases your chances to get an offer for one of your skills of course.
If you're looking for 2d art positions, I'd honestly look into the mobile and browser market for offers in Europe, before jumping across the pond. You will absolutely need a portfolio though. Testers don't have them, but breaking out of QA is often a perilous adventure (yes, it's a highway for a lot of people, but guess what, crashes happen)
With the skillset you seem to have (you have made games before), a 2d artist portfolio shouldn't be too hard to put together. Guys like Gameloft should scoop you up in a heartbeat with a good portfolio. And once you're in a company like that (I really have no idea how they run their shop) you could look into internal transfers to new locations around the world.
Just give it a go, post a portfolio in our portfolio section and see where our feedback takes you.