If you do a straight trace you're not building up forms.
Check this out:
Completely screwed, proportionally and stylistically compared to the ref, but it drives home the point. If you're trying to construct, you construct.
Notice you don't have to build up a skeleton, layers of muscle fibers and fat and skin every single time if you're not aiming for strict realism. Of course it's a worthy exercise
but it's waaay ahead of your level I think. You work your way up to it.
Now I'm divulging here, but I notice lack of construction is happening over and over in your work. Why are you neglecting to study that? I'm serious, man, it's gonna pay off 10x in your future work. You're pretty young, so learning this soon will put you ahead of the game and maybe ahead of me someday.
Try the first 2 books here. Redacted, sorry :[ -Crow