It looks like a excellent three dimensional painting, givig nice lfe to the subject.
I've tried below
1) to ligthten a bit the picture (center)
2) to convert to sepia tones to remove the colours and focus on values (right)
Wonderful effect !!! Congratulations ...
(https://i87.servimg.com/u/f87/19/31/59/25/19100210.jpg)