Start with light strokes of pencil and keep adding detail as you go. If you take your time with it you can add more and more detail. Try looking at a picture of an actual human to give you a reference.
If your hair is severely damaged, it will not be possible to get a color that requires pre-lightening, such as pink, without risking severe damage and breakage.
In order to draw details on a picture, you have to know what you are drawing. Imagine it is 3D, so you can see other features of the pictures. Then,...
You could look at your hand and then copy what you see. You could also put something like paint on your hand, brushing it on gently, to make the lines...
