Cass - Redemption Denied

Some artwork I did for a friend and his game Redemption Denied. (https://gamejolt.com/games/redemptiondenied/556726)
For the longest time we've been debating how we should make this character and I eventually just made my own version of her. One of the biggest goals was to create a charismatic character as well as cute and charming. Also, I wanted some punk like features on the face, so naturally I slit her eyebrow and gave her piercings as well as a neck tattoo. We basically settled on her having a robotic jaw and I went with the idea of being able to see gears and wires functioning. Also, I would like to state that Cass is actually a Human that got badly injured in battle and was rebuilt into a cyborg, which is why she is styled the way she is. It's my first genuine time trying to Take a real drawing and adding color digitally, and it was indeed a challenge. I'm not necessarily done with the project, I'm just done for now.
Oh, one last thing. If any of these know of any easier ways to digitally color sketched artwork please let me know I am open to any ideas.