>>1871627Fairly messy and inconsistent.
Make sure you keep all nodes and handles parallel like
>>1871597 said. You also want to start with the minimal amount of nodes. Only place nodes at the endpoints, and any major curves in the middle. Play with the handles and see what they could achieve without having to use another node. The less nodes, the less lumpy the picture will be. Don't stretch the handles too far where they begin to flatten at the nodes. Extend them only to where they keep their shape, and then add another pair of nodes in the middle, if needed.
You also need to pick thicknesses for certain parts of an image. You go all over the place. Pick a thickness for skin, hair, clothing etc. and make sure to match it throughout the entire image.
Here are a couple lines to show you what it should look like.
