You can clearly see the left ear is unaligned with the rest of the hat. At first, I thought my eyes were tricked, but nope, it doesn't align with the eyebrows, and is father away than the other ear from the nose. Also, the eyebrow is either too long, or too much to the left. Here's a quick sketch to explain:
While of course this might be intentional (I doubt that) and it's only a minor graphical mistake, I understand it's not much of a hassle, but... it's just.. bugging me!