Jeph, man, excellent job on the art. You've heard it all before by now but I really respect the fact that you are challenging yourself with your art. As an artist, I know what that's like, and I know the hardships and occasional frustration that can come with it (except, unlike you, I never pushed through it).
The first panel of today's strip, #1500, is amazing. The lines are awesome and the flow very well, and you pretty much nailed Dora's face. Marten's arms ans shoulders also look particularly good in that shot. (I confess, one of my major pet peeves I always had with your art was male arms. It's a small, silly thing, and in no way does it affect my opinion of the rest of your art.) I think it's also the composition of the frame - Dora and Marten are kind of squished together in a pleasing way, and Faye is on the other side, with the TV in front of them; it's a natural setting and creates just the right amount of tension in the shot. I don't know if you were thinking about all of this when you were drawing, but nice job.
Overall, congratulations on the work you're putting in, and the results you're getting out. Keep it up man.
On another note....for some reason, the third panel of today's strip really reminds me of King of the Hill, for some reason. Maybe it's Marten's eyes, and the whole "we're just standing around" thing. Hmm, yeah, it's definitely the eyes.