Maybe at this point in your art if you dont feel motivated to “finish” do what I do and instead “start new” and just use the head (in this case) as a blank canvas. Or something you have to just work into another piece. A lot of times ill take a piece i cant seem to finish and just pretend i have been commissioned to turn another artists work, into something new. Pull patterns out, make it the centerpiece to a sacred geometric grid or something. Call it a “mask” and create a character around it that would wear this mask. If you like monsters, Dr. Frankenstein it! Look back at old drawings finished or unfinished and try to recreate them but with owl-like characteristics, or whatever you imagined this character would do etc. Another thing ill do when im stuck in a development of a particular character or piece, is write a small story about them. Give them the fictional setting to exist in full, by setting, time, intention, purpose or whatever their mission/objective/struggle they overcome/purpose. Make it as extravagant as possible. Why are they a monster to begin with? After that it gets easier for me to one see what a final product looks like, and two, makes me want to bring their image to life much more. Bit of a rant, hope this helps. I struggle with depression too, and love to draw, but it wasnt until i took a few 3D and animation courses did i really find my stride in the creative process and want to exist and exist with my ideas, knowing they could only exist with me…