Step #1
Start the tutorial by making two ovals & a curve line inside the small oval.
Step #2
Draw ovals.
Step #3
Make outline for face & head.
Step #4
Make eye & retinas.
Step #5
Draw right arm & right leg. Also draw a bottom outline for the body.
Step #6
Make shell.
Step #7
Make lines and dots over the face and arm as shown.
Step #8
Make lines for the shell as shown.
Step #9
Make shell texture shape as shown.
Step #10
Finally, make necessary improvements to finish.