Hey, these look great! I think you really are improving--but that's only because you said that to me. I've always thought all your figure drawings were good.
Nice work, pal! I really like the energy in your drawings. I particularly like the first one, with its varying line widths and dynamic angles. I also really like the last pose, and sense of ground. And his back. Yeeeah, his back is cool. Oh yeah, and I dig your blog background.