This first picture is the nose, which is very different on a serval - compared to most cats which have noses resembling house cat anatomy, servals have a large and smooth nose, very rounded and almost dog-like.
One of my favorite parts of this picture is where the hair swirls and changes direction on his muzzle. I will likely add even more detail to that part, as it's crucial to the realism of the hair.
Even though the eye is penciled in (outlined in black) I will leave it for last. I love to do the eye, and saving it for last keeps my interest in the picture, and it really allows the picture to "come alive" at that stage.
More progress... I should be finished this piece soon, and I'm looking forward to seeing it finished!