Let's post inserting images

Hi guys! I need your advice. I have a blog where I add a new page called “Desktop Screenshots”. There is many people that upload their screenshot to Deviantart or any other site and they add a link to my site (where they bought the product used in their desktops).
So I want to they can reply my page putting the link to their screenshot and add an image or thumbnail.
What plugin do you recommend to install to do this?
Here is the page I’m talking about.
Thanks!