Only advice I can really give I think has been said pretty much already, stick with it, practice every day and don't be afraid to try some new techniques and styles too.
I have a bad tendency to take looooong breaks from drawing, and each time its like resetting from an old save game in one of those games that does the lame *** temp save system that you have to save every time you turn the game off WHAT A STUPID SAVE SYSTEM JUST MAKE THEM ALL PERMA SAVES...
Uhh... but yeah, keep it up!