Sketching from photographs is often most convenient for me because of my business travel schedule. I can use pictures from the web (free rights$ of use, of course) or magazines. And I can carry my own digital pictures as source material. The problem is that photographs often fail to fully convey the depth and shadows which are essential to defining three-dimensional objects.
Avocado Halves is a small charcoal sketch done from a royalty-free image from Public Domain Image. The photograph is sharp and clear, but it is difficult to get a read of the light and shadows. So I just invented the tiniest bit of shadowing at the bottom so as to anchor the object. Otherwise the avocado would seem to float in space!
Avocado Halves, Charcoal on paper, 4"x6", Not for sale
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