There are two main things when it comes to unwrapping, that determine its quality - continuity, and pixel density.
Continuity means that you don't have weird "cuts" or major changes in your unwrap, but rather that its as smooth as possible.
Pixel density means that for any region on the unwrap, you don't suddenly have much more/less pixels than other regions.
In practice, you can see pixel density issues as stretching, which is sadly very common for WC3 models, especially user made ones.
Checking pixel density issues is usually done with a
checkers pattern image, where it is very obvious if a small rectangle of it is stretched, or if all of them are more-or-less uniform.
In your case the texture is too low resolution and the model is too low poly to really see the pixel density properly, however it looks like the density of the head is very different than the density of the body (or are they simply different textures?).
The unwrap has many cuts - the connection between the neck and the body, the connection between the front and back parts of the body, the connections between the ears and the head, and the connections between the legs and the body.