I got custom fields working in the front end form linked in this post:
How to use nonce with front end submission form?
Here is the code used for the form page (custom page template): http://pastebin.com/YWyXL3jY
Hopefully that will be of help to you with a bit of tweaking to use image URL’s instead of text as the custom field input.
I had considered using the User Submitted Post plugin too but couldn’t figure out how to include custom fields with that, so ended up making the form by hand.
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