| http://www.w3.org/ns/prov#value | - I do not know much about shading and depth when it comes to drawing from life, so I do not know that I can help you there, except to encourage you to keep practicing I will say in regard to time that there is a noticeable difference in quality between something you work at for an hour and something you work at for two hours, but I understand the attention span issue.
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