Super great work! I did a quick paintover! The first thing I wanted to tackle was indeed that lighting, now I assumed from the original piece that light is coming from straight above. So with that in mind, I really thought about those planes of the face and which are pointing directly towards the light source. Really highlighting the cheeks, nose and chin pulling them more towards the viewer. I warped the face around a bit to get it more proportional. When it comes to the scar, don't be afraid to be prominent with it, if it indeed fits the character. I really wanted to make sure it was readable as a scar, making the whole scar side just darker in general, making deep grooves and hollowing out the cheek. Other than that, scars are basically just a texture difference, just either shinier or dryer than normal skin but still adhering to those same planes of light and shadow. I darkened the hair to put more focus on the face itself. Hope that helps! Great work keep going!