Let's make a cute, appealing design! Make it clean, rounded, shiny, etc so that there are no excessive lines, every stroke has its place. If you know anything about the style of Japanese anime, try to mimic that style.
We plan to have the design on our website, so we'd like a PNG file.
We'd also need the design to put on a t-shirt in the future, so we'd need the photoshop PSD file (or whichever format you create the original design in). This file should have a transparent background layer so that when it is printed on a material, there is no mismatch in background.
The mouse should be kind of cute like the ABC mouse (except ours is brown). Here's how that mouse looks like:
Also I'm attaching a photo of another design I like: it's an anime character, and he's stepping out of a car. In the same spirit, we'd like the mouse/boy and the ambulance.