OK OK as a diorama its heading in the right direction,as Karl points out the figures are from the wrong time period,but until a major plastic manufacturer brings out the correct figures i think many people will use the dragon figures(resin figures are poping up but so are the prices)converting figures is an option but unless you are an expert on brit kit or Karl

you may struggle,ive tried to figure out what some squaddies are wearing in pics but each load out seems to differ.
On a plus side the painting is to a very high level even the dog is well detailed,to compleate the diorama i would add some gloss varnish etc around the drain and some rubbish like old news papers torn card boxs cans etc,for the road sand might be too heavy unless you can find a fine version model rail road?i would suggest grimy pigment round the rubbish pile the curb and building.