Time for another "Ask Tobiah":

How did you create the graphics and character designs for your first game? I know you are a developer. Did you do it by yourself? or find anyone for it? As a developer, it is a big challenge. I plan to use Unity.
-Tae Hwan Kim

Hey, just because I'm a "developer" doesn't mean I am terrible at creating art!

...

I just happen, by pure coincidence, to be both a developer and terrible at art.

You have a couple easy options...

You can read more by going to the "Art as a developer" post on Tobiah Marks blog.