Changing sprite size on android devices.

I read through some tutorials on the libgdx site, and successfully made an animated brain walk around the screen depending on where mouse pointer ( or finger press on android ) was at. It works great, but on my android device ( Galaxy S4 ) the sprite seems very small. I read that you cannot change the resolution on android since the system controls it… so is the orthographic camera the only way to get my sprite to show up at a decent size?

Was hoping for a quick and dirty method just to get it working, but it keeps coming back to that darn Orthographic camera. :-\