Combining images

[User]

[attachment=3372 Wrote:Blighty pid='15398' dateline='1572944269']        

(11-05-2019, 08:22 AM)User Wrote: Is there any way to attach photos or I need to provide the link to  them?

See here:
https://www.gimp-forum.net/misc.php?action=help&hid=11

Note the file size limits.

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I've tried to copy horn , select space on face and pasted a horn into selection then in layer-new layer/transparency/add to Alpha Channel.
but it doesn't work with selection.
How to approach?
thanks.