Manually override feed element in settings using the FeedMe plugin
This is actually a bit of an issue with XML-based feeds. To Feed Me, both your node's are link nodes. They have different attributes for sure, but Feed Me doesn't identify nodes by their tag and attributes, so it'll look at all tags called link to get the image.

As you've stated, you'll be getting a bunch of errors due to this. Can you restructure your feed at all? The ideal method would be to rename one to &lt;image&gt; for instance.

Right now, there's no way to manually define field mapping, as its already complicated. You're more than welcome to submit a feature request.