[lampy]

Not bad for your first time. It's not perfect, but I'm sure you'll improve in time.
I think the best advice I ever read from an professional comic book artists who I admire, is make the backgrounds count or get good at drawing backgrounds; even if you have to use reference.
You should make your webcomics at minimum of 1024x768 for browsers and quality. No higher, if you need to go low, no lower than 800x600 it will just make your high quality line art look like crap.