Although an "artist" of extremely limited ability, I had a Damascene revelation a few months back that I'm trying to bring to bear on all my drawing -- what little of it I can find time for.
Like all such things, it's utterly bleeding obvious once you know, but revelatory if you don't already:
Good composition is infinitely more forgiving of bad drawing than the reverse.
... And that was the source of a substantial amount of frustration with my own artistic efforts. All care and attention to anatomy and perspective, loving detail and attention lavished on the inks, none of it can camouflage a poor, or uninspired, composition.
Keep working on, and re-working, the very roughest of thumbnails until you have a composition that is dynamic, or explosive, or menacing, or whatever you're trying to convey, but do
not try to move onto more detailed pencils or inks until you are absolutely happy with the composition, because nothing you can do in the later processes will rescue that initial deficiency.
Cheers
Jim