Some people use floor polish to add shine to the eyes, but I recommend using acrylic gloss you can find at craft stores, it is applied with a fine brush.
I don't know why you need to add shine to the hair, hair is not that shiny IMO.
Also, drybrushing is not the same a painting with pastels. This is drybrush:
Promodellers dry brushing - YouTube
Gracias por el video Cheungkinmen. I see the drybrushing can go after a coat of skin base.. to make the little details, like skin imperfections, shadows, 5 o'clock shadow, and stuff like that. But IMO the hair do shine a little, specially if the hair is brown or black.