even though you modelled the sketches exactly, that is one gigantic space between his ear and his cheek bone. Even though its cartoony, both humans and tigers do not have that much space between the front of the cheek bone and ears.

You do have some liberties to change the model to make it look good in 3d. For example imagine trying to model Homer Simpson. When you translate his sketches to 3d he looks wierd and bulbous, even though you can technically model his head line by line.

there is also texture stretching on the side of his nose. The hair looks perfect. Would like to see some wireframes.