>>1607590Your lines re too wobbly - you're following the image to the letter, instead of the spirit of it.
Also, your line consistency needs work. Especially the ears.
Red circles show places where errors are most prominent. Blue are line examples of where you'd only need 4-noded fills to make lines (save the chin/cheek line, which should be a three-point due to the taper, but I digress.
Overall: it need a lot of work. Take your time, adjust your lines for smoothness, and it'll look a lot better...