I just wanted to say that I struggle with self doubt a lot and what has helped me recently is adjusting how I look at that feeling. So instead of saying I have self doubt, I say, “I feel uncomfortable”. And I know that it’s Okay to feel uncomfortable because that just means I’m learning right now, and although it’s nice to feel comfortable, I want to grow as an artist. I spent five years working professionally and “feeling comfortable” as an artist and I didn’t grow or get better and at the end of it I hated the art I was making. It was incredibly uncomfortable to start questioning my work and if I was doing it right and to begin pushing myself again but a thousand times worth it.
So just keep going, it’s okay 
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Also it’s really common to feel like your sketch has more energy some things I do:
-clean up and leave the sketch layer on a light opacity under it and just leave it there in the final
- draw your clean up lines quickly in the same manner you drew your original sketch to get the “energy” back
Hope that helps