As you can tell, with snouts perspective is a
very big deal. Again, they're similar to noses, but also hands. Any small mistake you make on them stick out like a sore thumb. I'll try to explain each thing I circled more in depth here:
The nostril and the tooth: This is just a small perspective issue. sometimes it helps to draw a guideline for the snout itself so that you can get the details on it right. Otherwise it might, in bad cases, look like the character has a broken snout.
The bend: Snouts don't normally bend. Even on smaller snouts, they're generally an elongation of the face rather than a protrusion of it. Try not to think of it as a nose (even if they are similar), try to think of it as another big part of the face.
Facial extension: Like I said before, snouts are more of an elongation and less of protrusion. This also effects other parts of the face, and in general makes the sides of the face seem more "broad" for lack of a better term.