Hi,
I believe this was covered in a different thread but the gist of the answer is
-
Doesn’t work with unsplash links due to boring technical reasons (but will work with pretty much any other link)
-
Will not always be perfect, we actually use a third party provider for face detection and cropping and while that provider is the biggest name in the category they are not perfect. We’re definitely not implementing this ourselves so there is almost nothing we can do to improve it.