What should I draw/paint to sell? - 1

I sell my art as prints, iPhone, iPad, and cards on society6.com and I was wondering what I should draw that people will want to buy. I want to do something clever and/or current. I love Disney, and I'm not very good at drawing people. What would you buy?

Added (1). I meant iPhone and iPad *cases and skins

People will pay a lot for abstract paintings. I saw a picture going for 100$ at Aaron brothers, and it was just 3 different colored circles in a row with a green and grey background

  • What should I draw/paint to sell? I sell my art as prints, iPhone and iPad cases and skins, and cards on society6.com and I was wondering what I should draw that people will want to buy. I want to do something clever and/or current. I love Disney, and I'm not very good at drawing people. What would you buy?
  • What paint should I use to customise an iPhone for case? I want to paint the Incredible Hulk on an iPhone case for my older brother for Christmas, but what paint should I use? I've used acrylics before to paint my PS2, but it scratches off so easily and this is something I want to last. Any suggestions or other options I can use?
  • Is it ok to have a power inverter draw more watts than the battry has? I have a 12v 18 ah battery and I'm expecting to run it for about 3 hrs so then that is 72w coming from the battery, correct? Ok then I have a 200w continues power ac to dc inverter so is it ok to hook them up and can i charge something like an iPhone. Thanks. Sorry i put this in car audio i just have no die where it really belongs
  • Is it ok to have a power inverter draw more watts than the battery has? I have a 12v 18 ah battery and I'm expecting to run it for about 3 hrs so then that is 72w coming from the battery, correct? Ok then I have a 200w continues power ac to dc inverter so is it ok to hook them up and can i charge something like an iPhone.