Hi Brittney, One of my teachers recommended that I think of the muzzle as a sphere. The creases of the lips would sit at the equator line of the globe because the lips wrap around the sphere like muzzle.. as you move below the globe the equator starts to look like an upside down U or a frown, and from above the globe, the equator line look more like a right side up U or a smile.
Once you can plot the opening of the mouth, and you can find the center point of the lips, you can then approximate the lips as simple forms. The bottom lip is kind of like a cylinder, but its also like two spheroids, but it also has edges. So you can think of it as overlapping forms too.
I recommend looking at the lips of David by Michelangelo, he was a master at describing form
https://www.nma.art/3dmodels/david-lips-scan/
I hope this helps
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