You can add more contrast by making the shadow bigger and adding more color/ brightness to the main trio.
I drew a quick sketch IF this cover is for the same story you been posting recently where the two friends helping someone run away from their bad family. IF not, just ignore everything down below.
- The looming family is covering the runaway's eye with hands. It's similar to when parent cover their children eyes to not see unsavory things, or in case of abusive relationships, that's there may be a way out.
- The friends can be looking out for her and worried at the same time.
- Add most color to runaway for greatest contrast/conflict between family and runaway. Friends have some color.