You are able to do it Terry. I think it's lot harder in painting, cuz in pencil a darker o brighter shadow just depends in pressing harder or softer, while you must mix colors to get the perfect tone, and then paint. Dunno :P
But I do think you can do it, you said it, Jerry and Pat painting, a great example.
Hmm as for me? I should re-do my last drawing. I posted the updated yesterday, and I like the shadowing I got but his face... I must change it! It's not right, it's not sharing something I really want to show with the drawing so I won't be happy until you people say me "OOhh, I think he is bla bla bla bla blaaaaaaa" xD
<Smiling until death!>
<Sonriendo hasta la muerte!>