Hello I’m Leslie! I try to help out as best as I can 
-How do you draw the hair on ibis paint? I’ll show step by step
-Which brushes do you use? Round brush real
First I add Base Color and go to select it so it.
Then I set the layer mode to add and with the round brush real I 
I add a new layer and set the layer mode to add again and this time just go around the middle. Lower the layer’s opacity if you want <3
After that I get a darker color of the base and start from the edges to midway middle
or something like this 
Feel free to go back and add more highlights
Hope this helps have a good day and if you need explanation on some stuff I mentioned please don’t be scared to ask!