The top shoe in your pic shows some polishing in the centre of the web (spine?) which would indicate that that spot rested on a post on the backplate. IIRC the post is adjustable, by loosening a nut on the back. The cylinder pistons should be out far enough to have slots visible for the ends of the shoes to go into. The adjusters dont seem to have their 'pistons' fitted - also slotted for the shoe ends. The springs look correct, but the shoe ends are not placed in the pistons.
Year and model would help. The cylinder pistons should have the ends fitted to the boots so they stick out, not pushed right in. I used to have the springs fitted, put the top shoe in place in the piston and adjuster slots, then flex the bottom shoe outwards until you can get the shoe ends into the slots and swing it into place. Fit the drum, bleed the cylinder, press the pedal hard to centralize the shoes, adjust until locked, back off until drum turns, check that pedal is good, and handbrake works OK. If you have the shoes back where they were (same top and bottom, and facing same way),should be fine. The adjustable posts on the backplate allow you to ensure that the lining is parallel to the drum face, maximising area in contact. If not parallel the area is reduced, and the braking will be poor.
Youtube can help - springs should both be on the back of the shoes. Search for 'rover p4 rear braking'.