You are definitely talented & have a wonderful sense of proportion that seems to improve as you go!
Please don't abandon your art for working in an office, someday you may look back, realized you haven't drawn in years & regret it. Don't be one of those people that say "I used to draw in high school..."
If you still have to hold down a job, that's okay, but just keep a promise that you'll always make time for it. Always keep something going, even if it's for a couple of hours here & there, even if it's very detailed & takes a long time. Those are the best ones anyway, right?
I love doing the detailed pencil work, too-have you tried the Berol Prismacolors(colored pencils)yet?
Always find something to challenge yourself, & keep some of your old stuff so that when you're older you can go thru it & say "Wow, the stuff I'm doing now just blows this away" It's a wonderful thing to be an artist!
The only cat picture I have to post is a cheetah portrait I did a few years ago in pastel & colored pencil..most of the stuff I've done lately is people in pencil.
(I'm sorry if it looks big, it was the one I have on photobucket,I don't know how to make it clickable, they have a new format & I haven't been over there much lately)