This is okay. The shading doesn't seem to obey the light sources implied in the scene.
I get that the setting time is night, moon light. The main source of light seems to be the Moon. A secondary light source is from Raisen's eyes and finger. There would also be some back, ambient light that would slightly illuminate her back side. This way, you can still define the shape. While not a great example, [link] is a video I did in my motion graphics class that should give you a better feel for what I'm talking about. And looks like I have a reason to polish this up for project 3 in this terms Motion Graphics class.
It looks like either you have the special effect of red on a separate layer, or it was painted last. I'm hoping it's a separate object so it can be extracted separately from the drawing. This will give you greater freedom to control things, even in another program, like Photoshop, where you can further control things like blending modes (Suggests the Screen/dodge / Lighten grouping and the Overlay groupings of modes for light). And you don't have to do much. You can duplicate the specific layer and gain better control overall.