Here are two more head shots for you. Nick (FK) and Elisabeth (OC).
Another portrait of Lacroix. I let you do the interpretation. I'm willing to go all the way with this one (color and the likes), but I realise that I have to search for hand references and work on his proportions before I can do that.
great sketchbook you got here, the only thing i would advice is to keep some variety and to play with wacky angles and pushing your limits also loving the color studies keep those up! i like your style and love to see more ideas!
really like your pencils, it will be great if you can give me some advice on mines, my crosshatching/rendering for some reason come out looking odd or a bit sloppy.
Great characters, you have a nice liveliness to your work. One suggestion I have is that you could try varying your use of line. You seem to render most of your characters in the same way, with a medium-width crisp outline to every shape. How about using line as an element to emphasize character traits? Or even omitting lines, if they are not necessary? Another point is that despite the liveliness in your characters, they sometimes feel frozen - they somehow don't feel as solid as they should and lack 3D presence.
To aid this, I would study perspective a little (Loomis is great), practice making basic shapes in 3D from imagination, and making them look SOLID. If you make this investment, I am sure your characters will improve immensely, and your designs will look much more alive! After that, you may want to spend some time studying light on basic forms (observation from life, then from imagination). But for now, I think studying forms in perspective is where you will reap the most rewards. I hope this was helpful to you, give me a heads up if you ever need critique