>>1907933Much like
>>1907935 said, it comes down to experience. There is a a Measure tool to check thicknesses, but I don't recommend it, as you will end up measuring everything to be very similar thicknesses and end up creating stroke-like fills. As a general rule, make sure you make all nodes and handles parallel at all times. Then, work on the distance between the nodes to pick thicknesses for certain areas of the image, such as hair, clothes, skin, etc. This will take a good 5-6 vectors to really get the hang of.
Here is a quick example of what the leg and some of the skirt should look like. I worked on this from what you did, so it may look different from the original, but this is the general idea for thickness and parallel nodes/handles.
