Remodeling Bathroom-water pressure issues

I am doing the plumbing for a remodel of my bathroom and everything is brand new. I’ve googled reasons on why my water pressure is still really low in the shower; even increased it from the main valve in the garage. Using 1/2 & 3/4 inch piping throughout wall. Other bathroom and sinks throughout the house the pressure is fine, but this bathroom is having problems. Can’t figure out why?? There are 2 rain heads and a shower wand. Pictures from both sides shown. Wall is taken out on other side because other bathroom will be remodeled as well. Any advice? Simple terms please? Not an expert. Ha!