I just pick a side or angle.
If you choose, for example, the upper right corner to be the angle at which your light source is coming, then the shadows would fall opposite, towards the lower left.
If you are shading multiple objects, stick to the same side you chose on the first image you shaded.
That's just a general suggestion, tho. I have zero formal art training and am not Certified.
Certifiable? Yes. Certified, no. ;)
*chuckle*
__________________ Julie Ebersole (JulieHRR once upon a time . . . ) julieebersole.com "So shines a good deed in a weary world." -Willy Wonka
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