Leslie,
A cast drawing is more effective if you work from an original figure. It doesn't move, you can turn it, or pick an angle and set the light as you choose.
This appears to be a drawing from a photo of a sculpture. It does not have the same benefits. This drawing has problems, but none that practice will not cure. I recommend finding a sculpture, setting it up, and drawing it. You may find it much more rewarding, in terms of results, and enjoyment.
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