REDIUM, MY SAVIOR!
(If only I knew you when i made Reaper|Grim Reaper...no one replied to that art request thread :/ )
I love all the concept arts, especially the first gluttony (with the addition of multiple, larger mouths).
Although I'm obviously leaning towards the second sinner and the first gluttony because they're closer to the concepts I suggested, I've heard that art is an expression of the artist; I recommend you do whatever you want to do because it'll probably be more awesome-sauce than if I try to confine your awesomesauce-ness with limits.
Also, I'd love it if you would do an image for wrath, greed, envy, and maybe even sloth. However, I'm not sure if I want a dark image for pride, unless you can both make it dark and give it a noble atmosphere.
And just to clarify, lust should be sexy lady.
EDIT: Another thing I liked a lot about your concept arts is that they're black and white. After thinking about it, I suppose I would prefer the color scheme to compose of only grayscale and and colors so dark that they look almost black. In addition, I would prefer heavy contrast; such as only light gray, dark colors/black, and no midtones.
EDIT #2: Your first sketch of Sinner is card-worthy, I believe. Mind if I put it up?
EDIT #3: So I just realized that it'd be nice to have the sins color-coded, i.e.
Pride is brighter, Greed is darker, Lust would be green (for
, pink if it's
, but if it's color coded I can switch between the two colors with some quick photoshopping), Wrath would be red, Gluttony would be...orange? The color of gravity...Envy would be teal, and Sloth would be yellow.
On the other hand, these color schemes would be weird (green Lust? orange Gluttony? yellow Sloth?) so I'm having second thoughts...Again, best is to just do what you like.