It's never to early to rake in some cash, I started getting a legit paycheck around then
If you worked a little more on backgrounds it would give it a more professional quality.
Unless the papers in your area are saturated with comics it wouldn't hurt to submit one to them and see what they think, who knows maybe you'll be the biggest thing to hit Swedish comics in years
Do most of your drawings follow particular characters, stories, or political themes?
If you have a good solid recognizable formula it would increase your chances of being proffessionally successfull.
And Most Importantly...Do you do any Star Wars? Your stuff is sharp, but I'm not sure how harsh the moderators will be on something that isn't SW fanart