Hello there! (so sorry for the delay!) Lets see what I can do for you! Negatives I'm not sure what the two dots on his neck are suppose to be... maybe adding a little more detail there to make it more recognizable? His head seems a tiny bit to big to be proportioned to the rest of his body correctly Positives I love the simplicity of this!! It's very nicely executed! His facial expression is just great haha you can definitely see the emotion on their face! leaving the background a solid color was a very good idea, it doesn't take away from the drawing but there's very strong unity with it!
*Sorry if this was a little confusing haha I'm just starting to give critiques but hey there's a first time for everything, eh? Overall this is a very nice piece of work. Great job!