The art being "good" is subjective, just as who's going to pick it up and who isn't. I would say that the art from the pitch is good, but what makes it good is a combination of style and distinctiveness.
Add that distinctiveness of the artist's style of presentation with a decent enough character and a simple enough to follow premise and you've already got a decent ground to stand on.
Now make that into a comic strip specifically made to be presented as a pitch and there you go, especially when you're putting it in a contest made to encourage people to send stuff in. Things like that strip or that activity book are decent examples of ways to pitch your stuff as it presents your ideas with less chance of boring who you're presenting it to, offering something that gets you familiar with the characters and how they can be used. It makes people want to like it, which makes them want to see more of it, which makes them want to make it a short/series.
In the end, you don't need "good art" because it wouldn't solely be your job to draw everything if you make a series, it could even be someone else's job to make sure characters stay in whatever style is chosen for said series. Being able to visually present your idea for a cartoon is important, but being able to draw something like the mona lisa doesn't guarantee that your idea will even be interesting or good, which is what also a big part of what you're presenting.