hey dude, nice stuff ! for the zomby kids' illustration, you lighted your scene as if the light is coming from above the teacher, but your main light source is coming from about the middle of the room, maybe it's a perspective issue ! it'd be faster to change the light position rather than changing all the values ! keep it up
Thought you knew I hate my paintings haha, I feel the forground is a bit overwelming, the orgioanl sketch has the knight has highest contrast so it pop out more, the new one's forground is too strong its contrast to other thing reduce the important of the character