By then, you should have your model's hair smudged. If not, go ahead and do that now.
Once you have done that, color in the hair using round brush (point) with the color black. (Note: This will only work if the hair is black to make it neon, or idk how to explain 😭)
On the same layer, lower the size and add small strokes to make it look like hair strands! But don't do too much, you want to make this realistic as possible.
Your model should look like this
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Next add a new layer pick the color of the background or any desired color. Make sure the circle is literally towards the center.
Like this:
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Then, draw the strands and make sure there's space between them.
You can go ahead and do both sides. Once it's done, it should look like this
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Add a new layer, and lower the opacity to 5 and make the size a bit bigger. Fill in the spaces between the colored hair parts.
It should look something like this
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Add another layer and set the mode to Add. Pick the lighter color of what is on your model's hair. Draw several strands.
It should look like this:
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Add another layer and set it to Add. Lower the brush size to 1 or 1.5. Draw overlapping strands on the ones you've previously have drawn.
It should look like this.
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And there you have it!! If you have any more tutorials you want to see, comment! I'll be making more! I hope this helped you <3