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I start some exercices around value, luminosity. this is my daughter. No grid, 2 hours working.
when you are drawing you will want to take a little more time in the beginning to check your shapes and map out the proportions. yours is a bit long in the face, for example.
However, the assignment, as lovely as she is, is to do master copies. If you want to just do images and such and get crits you can post to the crit center. I have moved this to the composition forum in case you wish to do the assignments.