Yeah.
I have painted the elementaTD banner for their site, now its different i guess they removed it.
http://antonmagdalina.carbonmade.com/projects/2494254#3
I have not tried to get into game studios yet, plus, 2D artist is a very narrow field in game and movie world.
I will try to get somewhere when I get some free time from my current work.
I use "anything on everything" to get the result I want, after studding all materials and chemicals, I know what mediums and techniques I can use together.
Use oil paints on wooden board, Masonite board is best. Acrylic use on anything!
Because Acrylic is cheer than oil and water-based you can start a painting with acrylic and, when it is dry, paint with oils on top of acrylic.
but(don't paint acrylic on top of oil, the acrylic will flake off)