Ihinfuo, I really, really, really, really, really must say that your figural forms are very well-defined and articulated. You've done a very, very, very, very, very, very, very, very great job on those forms.
So, if I was to suggest an improvement, that is, in the case of the shading, that your tones are a bit too monotonous for me. Would you please check out this link here?: https://line-of-action.com/storage/4911/LoA-1536480630.pdf
The sound mind behind this is as a result, your shading performance will fairly and dramatically improve once you download this link on mastering your pencil's tones.
Hope this've helped you out the most.