The art is simple and ok, the expressions and movements are fine and the details fit with that kind of comic. A small background would be nice in there but it doesn't matter.
But overall, this comic is a very bad example for every artist. It tells you to ignore critiques, which are very important to make progress. Also, I have to agree with the man in blue : this comic is too predictable. The "sound of nobody caring" joke has been already used a lot of times.
You should NEVER ignore criticism, they are what makes you a good artist