No offence dude, but I would recommend you would give up on the idea "for now" of trying to sell your pixel art talent, and for a couple of weeks, do alot of tutorials.
Your pixel art shows you barely know the basics.
Start with this tutorial. It is isometric and will teach you some of the basic rules of pixel art as well as teach you lighting/shadows, outlines, etc.
Come back after a few tutorials, and your own original examples using what you have learned. People will jump at the chance to pay for your art.