Hello Polyvios Animations! Thank you so much for your feedback on my work. Bozin has also stated earlier in the discussion thread that I should try to use more lines continuously and I agree that I am not confident in my line strokes.
I'm not actually giving any hair to the bodies/hands I drew, and I'm glad about your honest opinion on my work ^^ I will try to be more confident in my illustration abilities.
I also checked the link you attached and I'm grateful for the advice! I think that doing warm ups will help me get more confident and comfortable with my works. Thank you so much for the insight!