In the Engine Configuration you are pointing to the SRB-A nozzle. I would put dual lines (one to each engine) to stress out that it uses two. Or you can put "Dual LE-7A".I would add the payload adapter to the right image of the stack. And add stage diameters.Also, First Stage and Fairing vertical dimensions overlap with Second Stage's. You should cut FS at the stage adapter and same for fairing.
I think the SRB need to be rotated by 45°?