I just had an interesting thought: Art is never meant to be "completed."
Drawings are never finished. There's always something to add, or something to adjust. At some point, it just feels like the effort is no longer cost effective and the product is good enough. But even if we did continue until completion, what would we have accomplished? This might not apply to all art, but for realistic/image-based artwork, in order to truly "complete" something, we'd have to recreate every individual pixel with the exact same RGB color values.
But then it would be pointless, because we would have just copied a file!
I started a self-portrait in January, but I've been slow and often distracted since then. It took hours for each ear. At least now I have almost three weeks of freedom before I have to return to unhappiness and sleep deprivation again. Yay?