Feedback from the teacher/students for my poster

Some of the feedback i got for my poster was that there wasn't something right with either the postioning, colour, or the depth/layers of my poster. So firstly i tried altering the postion of the different layers and pictures. Then i tried altering the colours. Firstly i tried making the whole poster darker, but this didnt solve the problem, it just made it harder to see it. Then i tried making the picture of the murderer darker, it looked abit better but hen it didnt work well with the coloured picture. Therefore i turned the whole poster black and white, and adjusted the lighting slightly. This made the whole poster look alot better. The only problem with my poster now is some of the layout, i need to figure out where to put everything to make it effective.