Hey, it's great to see more familiar faces back here!
In your first character sheet, the samurai is very well-drawn, good consistency between the different views, and concise details make this useful. However, I do find the design a little sterile, and although not every character can be over-the-top with ostentatious and overt attributes, a little embellishment here and there as to the nature of the character will make it a little more useful in your portfolio to show your clients that you do have that ability.
Not much to comment about on the second one. I do quite like it, but you could communicate the atmosphere a little more clearly. To me, it looks like it's under water, but not quite. Also, a little more rhyme and reason to your brush strokes will pull it all together.
Third one is great, quite alluring.
Your fourth one, I do like, but the execution could have benefitted from a solid or opaque medium.
And as for the last one, the rendering needs to be tightened up, or if you want to maintain that spontaneity or quick rendering, a different application of your brushstrokes would help to communicate the rocky surface better.
Great work in all quarters, and let's see what else you can do! | 
