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 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. Any ideas on how and where to advertise.
  4. Is the pricing right?   

If you are interested please leave your email id here ( http://goo.gl/forms/2XvD3UtjSv ) so i can reach you when i launch.