Yeah.....excellent work! I'm totally impressed. I really like your colour choices, lots of "pop" there. I like how you used markers to fill in your coloring as well. I used to do that (back when I used to draw ).. It gives great texture.
Although it's hard for me to narrow down my favorite, I'm really in like with the Sky Lynx sketch. A lot. Thanx for finally shareing this stuff. It's always nice to get a glimpse into someone's sketchbook.