@andersoncarman Thank you Andrew - much appreciated!

@evilrobot I use Clip Studio Paint Pro which has been great for all my cartoon work. I have an older version of Photoshop 7, but Clip Studio just seems to be more comfortable for me. I'll check out those links - appreciate it. I spent all my adult life in the military, so I've got a whole lot to learn in creating art. This seems like an excellent place to make improvements.

@Jim-Algar You make a good point - I'm looking at material now to help me better understand the effect of light and shadow.

@Kat - That's a great example - thank you for that!

I've become a fan of Will Terry's YouTube channel and the great advice and insight he provides. I've purchased several of his SVS courses in an effort to improve my work, but I've still got a long way to go. I'm a cartoonist and decided to use my character to experiment with some of the techniques I've learned here, but I can't seem to make the line of the mouth look more realistic in terms of shade and light, and the outer outlines of my character are awkward. At any rate, I'm really glad I've found these courses and look forward to learning lots more.