When I get stuck, I edit the image on a program or on my phone.
Mirroring an image is such a mind trip after you have been drawing it from the opposite angle. Try Mirroring the picture to see your underlying issues.
Another good thing is to draw your reference right side up, and you upside down.
Mind teasers like this help us see things we are missing.
Or leave it for a week- if you can- and do something else for a bit. A change of pace can allow your brain to problem-solve in your subconscious.
Breathing exercises are also a good help, especially when you want to finish it. The finish attitude is a killer of a lot of great art.
I hope some of these suggestions help.
All the best,
JCML Fine Art
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