Fashionography Cycle 1 - Winner Announced!

I decided to use an old pic of mine back from Jojo's Victoria's Secret comp as my example. Here is a side by side comparison of the finished product vs what she started as. Note that she has filters on her to match the background's lighting. This should always be your first step when working with lighting. You don't need to do many filters for yours, just a couple on low transparency to mesh her and the lights together.
https://cdn.discordapp.com/attachments/490572143390883843/574076711046479872/Example1.png

Once you've added filters, then you draw light on her. Make a new layer and CLIP it to the sim layer so you aren't drawing on the background. Change the layer mode to Screen.
https://cdn.discordapp.com/attachments/490572143390883843/574076760900239361/unknown.png

Grab your brush. Set the hardness to 0.
Set Mode to Color Dodge.
Change Opacity to 30% and Flow to 30%. Adjust as needed of course when drawing. Unless you have a tablet, then just turn pen pressure on as it's easier.
https://cdn.discordapp.com/attachments/490572143390883843/574077772612370442/unknown.png

Color pick/eyedropper tool the color you are drawing first. I start with blue, the light behind her.
https://cdn.discordapp.com/attachments/490572143390883843/574078514920423435/unknown.png

Now as I'm drawing I'm already realizing that 30% just isn't strong enough for me (I'm using a mouse instead of my tablet). So I turn up the opacity and flow a bit to make my life easier.

I place my mouse about where the red O is and draw from that distance (note that my brush size is larger, this was just me showing the placement). If I draw too close it will paint too much on her. I'm adding a base layer at the moment, then when I am done I will go in and add a stronger highlight to the edges.
https://cdn.discordapp.com/attachments/490572143390883843/574080274812633099/unknown.png

Here is what I have so far. Notice the subtle blue. If you look at the example pics for the assignment you'll notice soft highlights, then strong highlights. Especially the closer the light is to the model.

Now I'm going to turn the hardness up and go in and add a strong highlight
https://cdn.discordapp.com/attachments/490572143390883843/574080906797645825/unknown.png

I also noticed the lighting was slightly too dark compared to the light hitting the lady in the back, so I selected a brighter color from that same blue light in the background (I'm still a little off, but closer than I was before). Now I draw a little closer, after turning up my hardness, and start adding a stronger highlight around the edge where her hair is closest to the light.
https://cdn.discordapp.com/attachments/490572143390883843/574082716212133889/unknown.png

Messy before and after example, but you can see that she's got blue tints on her hair AND she has a stronger highlight at the edges where it's closer to the light. So that's all you're doing for the assignment. Just adding lights and then drawing lighting on the sim.
https://cdn.discordapp.com/attachments/490572143390883843/574083414832185345/unknown.png