Jokes aside, the best way to get better at art really is just practice.
...Which is why all the horny artists are so good; they're motivated so they practice more.
(If you'd like some actual advice, focus on getting fast over getting good. Once you're fast you can just do more practice faster, and quickly overtake anyone who focused on being good first.)
(...Also if you're fast enough you can crank out something serviceable between starting to feel horny and needing to get off. Oh no the horny artists keep winning.)