Jalyn
I am in agreement with GrannyGravy13. I think that M&S has upped its game over the past couple of years and I have made a number of purchases this year, mainly jeans and jumpers. Mostly purchased online and collected instore. I usually order a couple of different sizes of the same item and return what is not needed or doesn't fit/suit me. I don't take much notice of the model's pose or facial expression. If I think it's something I may want, I click on the image and look at the subsequent images. I then read the product details and reviews before buying.
I only do online, collecting them from round the corner or returns, and I also buy 2 sizes often, nip into the next shop to try them on, nip back with the return item.
I also like - very much indeed - that if you come up with a difficult situation, you can still actually talk to them - gasp in person on the phone.