Let’s create the mouth. Draw a mustache in black then add a motif for it.
Draw the motif with Shape Layer.
Copy the motif then resize it, and add a circle. Then combine them with Path Selection Tool (A). See this picture below as reference.
Then copy this new motif on the entire part of the mustache.
Add highlight by manual brushing on a new Clipping Mask layer. Set Blend Mode to Screen and paint white.
You can use path. Draw the path for highlight with the Pen Tool (P) then Stroke Path with Brush.
Draw the shape you see below the mustache with #dca115 color setting, name it Divide and then add Drop Shadow and Bevel and Emboss.