Is there any relatively simple way to sharpen images?

[denzjos]

I've seen the transparent layer. My solution was to use blur/curves and the on a flatten layer of the cloud. Fast solution. A professional solution is to make a selection op the mouth, shrink the selection (2), make a path from the selection, set no selection and stroke the path with the (here) black color (2). As Ofnuts suggest in another post today.

https://www.gimp-forum.net/Thread-Any-wa...-selection