here are my drawings, it's harder than i thought

Hi, here are my master drawing line study with James Gurney and Jeff Watt. unfortunately I dont have charcoal and I am not sure about what did James Gurney used in his drawing so I just used graphite. I lost patient a bit when I was drawing so I didn't get the poportion right in the drawing of Jeff Watt. I would like to hear your feedback and thank you for your support.

Hello, here is my rhino and I tried my best. I would love to hear your critique and appreciate your help.

Here is my drawings. Feedback is appreciated

Here are my drawings. feedback is appreciate.