Actually, the color selection in the warlock rocks. Your hue is all over the place, but it works together. Hrmm, this would look neat if you had done it in watercolor instead of marker, because markers are quite brazen and embolden these colors more than they need to be.
Your sketches are quite good, and I think an improvement. Your Mr. Samurai is quite good. I think although you have improved upon this aspect of your work, the sensitivity to line would be an area to work in.
The sketchiness can be a desired effect, but it looks like this is happening without an effort for it to be so. Smoother strokes with more confidence will come in time. Also, don't neglect your anatomy!
Keep at it. | 
