I wanted to share and get feedback good and bad, comments, critiques welcome. I'm super rusty and haven't painted or drawn anything in months, I also suck at backgrounds and did my best to practice drawing one this time.
The story is this:
I drew this as an art trade for a friend of mine (she wanted to draw my character so I offered to trade) who has a character named Mouri. She's adorable.
Mouri is about the size of a doberman. Dervacor was relaxing in the sun and she jumps on his belly and wants to go for a walk. Dragons don't need leashes, she is being a goof.

The full resolution image is here:
http://m2tm.net/art/walk_color_text.png
Without text:
http://m2tm.net/art/walk_color.png
"We can be richer than industry as long as we know that there are things that we don't really need." -Willy Mason
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It looks like you have a good base of skill, its easier to give a general critique if you post multiple images. Judging from this one, it looks like you still have some work to do where light/color theory is concerned.
You may want to check out this book: http://www.amazon.com/Color-Light-Guide-Realist-Painter/dp/0740797719
The main thing is right now the rendering is not looking confident. The rocks look fuzzy, the ground looks very digital, and the shadows on the characters are a bit inconsistent.
I'll try for a Paint over tomorrow to illustrate some points.
I'll absolutely check out that book! I think a good color-theory book would help a lot. This is actually my first whole-hearted attempt at moving beyond line-work. Basically painting right over the lines, destroying them, and not keeping them as a foundation. I am not at all practiced with backgrounds and struggled a lot on figuring out setting. I learned a lot painting these rocks, even though I think I just got a bit impatient with them and didn't push the rendering to something less sloppy (making them appear inconsistent with the characters.)
I'd love a paint-over.
I'm actually a super old forum user, but I haven't been around in like 7 years!
I will post more images when I finish more. I haven't picked up my tablet in several months so I don't have other current work.
I can show you where I've come from though with some of my older images. I am already aware these are all problematic in various ways, but at least it'll give you an idea as to where I -was- and my current trajectory:
https://scontent-b-sea.xx.fbcdn.net/hphotos-frc3/406315_10151043533083734_85575970_n.jpg from 2011 (45 minute speed painting)
I'm not a huge fan of how this one turned out. Both rendering and character design bug me, but it's another friend's character, not my design:
https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-ash3/741316_10151348589943734_610781292_o.jpg from like 8 months ago I think I spent 4 hours on it? I'm not sure. I remember getting kind of disheartened with how the character turned out, but wanting to finish and rushing through it and slapping in a background.
These all represent baby steps into the current piece I posted.