Here is a digital painting of Ero and sketches for his expression sheet.
I started out coloring Ero, yellow/orange, I kinda liked it but when I started to think about how all the backgrounds were going to be browns, yellow, oranges, and reds I knew that the character would get lost so I changed his color back to green.
Here is Ero's expression sheet.
Left to right top level: Neutral, eye roll, glare, wince/strain, quizzical look
Left to right bottom: bored, happy, fear, sad, angry