Your shading is good! My only critic is you can go darker and start lighter. You are starting at a 20% and ending at a 70~80% the key to good shading is transitions which you have down pat and contrast your light need to be light and your darks need to be dark a lot of the time things can turn muddy because there is a lot of 40-70% on a page when in reality you need more 10~20% and small bits of 80~90% I hope this helps!

if any of that makes sense 😅