What do you mean by “use an image link for these redirects?”
1. Display an image with a link wrapped around it
<a href="https://example.org/go/link/"><img src="https://example.org/path/to/image.jpg" alt="" /></a>
It works. Just insert an image as usual, and put the GoCodes link in the image link field.
2. Redirect to an image URL
You take an image URL, such as https://example.org/path/to/image.jpg
and create a GoCodes link that points to it, so https://example.org/go/image/
would forward to the image URL, allowing you to do something like this:
<a href="https://google.com"><img src="https://example.org/go/image/" alt="" /></a>
This should work. I haven’t tried it myself, but technically it should be fine.