Ask HN: Please validate my business idea.

Concept:

  - You upload a photo along with a little slug line. 
  - We convert it to artwork (example here:  http://bit.ly/1ZsJhXd ), 
  - We print out a large high quality poster and ship it to you in a mail tube. 
  - Price is USD 15 + shipping. Delivery anywhere in the world.

This is more to achieve a steady monthly income to pay the rent than become a big business. My Questions:

  - 1. Should i do a mobile app or a website? 
  - 2. Can this business generate USD 10,000 per month in gross revenue? (That's selling about 600 posters a month)
  - 3. Is the pricing right?

(My earlier post did not gather enough feedback. Much sorry for repeat)