So funny! I love the look on his face in the second panel. I also love the barista's hair! I feel like I've seen a barista with that exact haircut before.
As for critique:
The only thing I notice is that the chair looks almost like it's leaning backwards. I think there's something weird going on with the perspective of that part.
Other than that, the comic made me chuckle and the art looks nice! Great job!