Chester happy - pens

Description:

Hello there ! It's been a while since the last time I came... sorry ! Here a new drawing I did a few days ago. I wanted to work on expressions and here I tried something my brother explained me sometimes ago : using dots for the shadows. But I'm not sure if the result is good or no... What do you think ? How can I improve it ? Would it be better with lines ? Well what do you think of the drawing in general ? =)