I've been "seriously" drawing for about 2 or 3 years now, but over the past 5 or 6 months I've definitely seen the most significant improvement in myself. I've gotten to the point where I'm happy with what I can do but I know I can learn a lot more, I've gone to a lot of places looking for advice, I get some but for the most part any critiques I can get are few and far between. Lurking around here I've seen a lot of useful advice.
(click the spoilers for larger views)
An entry for a character of the week competition
"It's like the merchant from Resident Evil 4 and a shyguy had a baby"http://fc09.deviantart.net/fs71/f/2010/057/b/c/A_shy_one_by_Veromorte.png
A weekly character design challenge that went incredibly well, I love how it turned out, experimented with lighting and I think I got the mood I was going for.http://fc04.deviantart.net/fs70/f/2010/050/4/9/Eddie_Morrows_by_Veromorte.png
Probably one of my favorite images I've done, an inside joke with friends that took on a life of it's own, tonkahttp://fc05.deviantart.net/fs70/f/2010/048/2/6/TONKA_TOUGH_by_Veromorte.png
A comical modern revamp of good ol' duck hunt.http://fc00.deviantart.net/fs70/f/2010/033/b/4/Duck_Hunt__Apocalypse_by_Veromorte.png
A tribute to McBess, had a lot of fun with this one, biggest I've ever worked.http://fc05.deviantart.net/fs71/i/2010/072/d/9/McBess_Tribute_by_Veromorte.png
Koffing and Weezing gajinkashttp://fc07.deviantart.net/fs70/f/2010/098/9/4/Koffing_until_you__re_Weezing_by_Veromorte.png
Probably the highlight of my work, a project I took on back in november, 50 characters total and over 100 hours poured into the project I couldn't have been happier with the result.
Caricatures of people from another forum I go to using there names, actual pictures of them, or characters they use to make each one.