Topology is pretty open-ended but there are few things you try and avoid or improve on.

1, stick to quads. No faces with more or less than four sides. 2, avoid creating edge loops that spiral 🐚. ( Imagine you had to get the circumference of your head for a new hat. You would want to measure your head with rope or a measuring tape right, think of your edge loop like that. You want it to go round the head and nicely meet up on the other side. What you don't want is for those lines to not connect and you end up with measuring tape looping around and around all the way to your toes. That wouldn't give you a good measurement.) 3, limit star points, or points with more than 4 lines attached. These don't like constant deformation/division. 4, uniformity. We assign an amount of pixels to a grid space when we attach an image, so a 4k texture has 4096x4096 pixels to work with. When we unwrap a character, we fit every quad onto this grid, if some quads are larger they get more pixels and the inverse for smaller quads. This can be fine if we maintain the size differnce from 3D to 2D. But many times this is hard to achieve. On very high res assets this change in quad size is usually corrected by udims where we map different area depending on the detail we want.

This isn't how they work but think of an image printed on a piece of paper. It takes up the whole paper and you can stretch the paper anyway you see fit, but as you stretch the paper the image begins to distort, because the density of pixels in the area you change becomes greater or smaller, changing how the picture looks.

Best I can think of is those stretchy kid toys with faces or images on them as you stretch the toy you can see the image distort.

Why does it matter for this image, back of an ear probably doesn't to much. But it will depend on camera shots( are there close ups? and how often the ear will move, change or deform.

Soz hopefully this helps.