@Daniel-Grissom Hello fellow Teacher by day and artist by night.
I love your drawing and style. The animals look well drawn and are very interesting. I would say that there doesn't seem to be a central focal point and I am not sure what to look at in the picture. You might want to think about what is most important and center all the animals around that point. Maybe the barista or a central table? As far as color scheme I would find a few pics of coffee houses and steal their palette to try out.
Hope this helps! If this is your starting point you are doing really well. I can't wait to see how it turns out.