Short animation movie

Hello all.

I’m going to create a short movie in Blender, for which I already finished the script. I’ll start on March and plan to finish during this year.
One of the first things will be of course to make the characters, and this is where I would appreciate some help for the concept art.

It will have mainly two characters, a girl and a boy, both young students. I pretend the style to be similar to these examples from Pixar.
I have not drawing skills (but I’m trying to) that would allow me to sketch the characters, so if anyone would be interested in creating these two characters drawings I would be glad to create the 3d models based one the drawings and give the respective credits on the movie.