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Here's some submissions for y'all comments. All of my doodles are done in Sketchbook Pro currently. I do like the freedom that I get from digital art but I do like to go back to traditional paper and Pencil/Pen. More to come as I get them off of my other computer. I'll get photos of my old sketches from my paper doodle too later. I hope the participation in this forum motivates me to produce more and more.
Well, good for you for starting a sketchbook. Try to keep it updated as much as possible.
The first thing I notice in these is a poor sense of lighting. Try to choose a direction of a light source and keep it consistent. As of now there doesn't seem to be much rhyme or reason to the shadows and highlights, and everything is in a middle value (except for the whites of the eyes and teeth, neither of which are actually pure white in reality). Take a look at this tutorial I wrote a little while back and then do a study or two from photo reference or a mirror (I recommend doing it in black and white instead of colour for now):
Oh, and try to post your traditional stuff too, I would love to see it.
"Complacency is the womb of mediocrity. " -- Jason Manley
"If you always put limits on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you must go beyond them." -- Bruce Lee