Marketpress for selling pictures

Hello,

Is it possible with Marketpress to make a webshop where people can download pictures after they have paid?

It is necessary that people cannot download one of the picture by clicking on the right mouse button and click Save as?

I also would like to have the option to do different variations of one picture. E.g. picture of 300x300px, 600x600 px.

Is that also possible?

Greetings,
Jonathan