Shopify app for product personalization

I would like to have a app that can do something very specific. I sell posters and canvas and I need a way for people to personalize those itens and upload their own art.

Things to consider:
- The app must be fast so people do not feel frustaded;
- Upload and preview art is essencial
- May consider an option to have 1,2, 3 or 4 upload art
- May consider other products other than canvas and poster for costumization
- Must pay atencion to a minium of pixles require and a maximum also.

Thanks