Your case is very interesting because you have a really beautiful command of value and tonality, but your line work and line weight control is really undeveloped.
Maybe as an experiment, take a piece of tracing paper and sketch over one of your “value” pages. Try to get the linework, and line weight to offer the same amount of depth and form description. Experiment with what lines need to be heavier and which don’t. It will feel very artificial at first, because humans don’t see in lines, only value and color, which you understand really well. Spend longer on the linework studies than you think you should. Generally yours are under worked.