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I am trying to make a ring smiley mouth, as seen in the image below:

enter image description here

And here is what I have so far:

enter image description here

I've made a circle, converted it to a curve, and applied bevel. In Edit Mode, I moved the selected vertices a bit down to make a smile.

But the problems I have right now are:

  1. The top and bottom parts are uneven; the top lip and the bottom lip have different sizes, the bottom one is slightly bigger.

  2. There are wrinkles on both sides of the corner.

I want to make that clean even curve like in the first image. Are there any other ways you guys can recommend?

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    $\begingroup$ It's always good to note the source of an image if it isn't (obvious that it's) made by yourself. Is it also the case that the curve is not a complete loop? There seems to be a connection missing in the upper left corner.. $\endgroup$
    – Joachim
    Jul 29 at 18:17
  • $\begingroup$ Yes, I just realised, thats another problem. I tried connecting those two vertices by pressing F but I get an error message saying "cannot make segment". I dont get it because I only converted a full circle mesh to curve $\endgroup$ Jul 29 at 20:08
  • $\begingroup$ I don't think the lack of connection is a problem if it was a converted mesh. If you look in Active Spline it will have Cyclic U checked, which makes it continuous. $\endgroup$ Jul 29 at 22:00
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You can create a bezier circle (4 vertices), give it a Bevel Depth, and tweak the Resolution values, here I've tried a Shape Resolution and a Bevel Resolution of 12. Give it a Subdivision Surface modifier and it will fix the bad shading. It looks like to avoid wrinkles you need to rotate and play with the vertices scale a bit, I'm not sure you can avoid them with all the shapes it will take. To animate, hook to empties of bones. You can play with the thickness of each vertex with its Radius value (N panel or AltS):

enter image description here

enter image description here

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Try increasing the Bevel Resolution further. Unfortunately 32 is the maximum and even manual input won't go any higher.

enter image description here

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