#1: This would be more appealing if cropped so it's square, with the plate centered. You might try a tablecloth under the plate to see whether you and the owners find the shot more attractive with it. More-even lighting would help, and greater depth of field so the stray berries are in focus as well as the big dessert bar. I agree with russ71 about the crumbs. Some photos of fancy desserts include decorated plates where the chef has sprinkled something around, but these chocolate bits (?) look randomly fallen.
#2: The meat looks good, but the rice looks gummy. If all their rice looks like that, put the rice in the background where viewers can think it's merely blurred. Or change my order to potatoes, please. Assuming the present composition is repeated, maybe shoot from a higher angle so the beans are clearer. Try a contrasting-color tablecloth for this one, but not distractingly bright. Show more space next to the plate at the right and less at the top.
#3: Too dark overall. The man's pose is very good, with the plates at different heights, but next time get the woman to hold her tray level! Good choice of colors for their clothing, given the background.
#4: Also too dark. I don't like the way the chair at the right is cut off.
#5: Too dark, and it could stand some cropping at the left, where there are many small OOF objects that seem irrelevant. (You can cut off the chair this time. It isn't there as an invitation for a guest to sit in it.) The much lighter area at the window--I don't know, my eye keeps going there, and I don't think that's what you want if the subject is personnel.
EDIT: One more thing about #5. What is this man's job? Is he waitstaff, cook, or something else? Maybe a caption will say, but posing him with tools of the trade would communicate it instantly. As the advice to fiction writers goes, "Show, don't tell."