I don't submit a lot here thoses times, well, I am in a phase of my life when i only sketches: i am not as patient as i was and i really need to practice. So i draw everyday and try to publish them on my sketchblog to still motivate. I realize that's a really good thing: even if i don't submit a sketch i do it (even if i don't have time ) and i know that i improved just only this month and so i am pretty happy
I work almost everyday with 30sec. This is a very nice website to practice and improve! I think i just felt in love this it *-* If you don't know that website you should just take a look
Here's my sketchblog (on tumblr, easy to follow, i love it *-*) where i try to submit everyday

Oh and a last thing: Excuse my french !
I suppose that next step is to improve my english haha !