It knows what a face looks like! <a href="https://i.imgur.com/wA1iQ7T.png" rel="nofollow">https://i.imgur.com/wA1iQ7T.png</a>
I tried with 2 icons I custom created. <a href="https://imgur.com/a/ZtseO8j" rel="nofollow">https://imgur.com/a/ZtseO8j</a><p>The first one (the arrow into the door) seems to have worked well for the first three 'similar icons'.<p>The second one (remove user) didn't work at all. Maybe because it is circled.<p>In both cases, half the similar icons are 'download' icons, and I can kind of see why for the first case but not at all for the second case.