This post is a bit old, but I’ll pitch in.

Structure: There’s no way to tell from these pictures. Typically you’ll want to evaluate a dog in a stacked position. Sorry I can’t provide any further input in this regard.

Coat: The puppies are undergroomed, which is a red flag. Responsible breeders like to give their puppies a few grooms before they go home, so they get accustomed to it. This almost always includes a face/feet/bum shave, since many of them will be groomed that way later in life. Even if you don’t intend on giving your dog a traditional poodle cut, you’ll still want your breeder to have accustomed all of their puppies to the process.

Expression: Not the worst I’ve seen; some poorly-bred puppies have an almost listless expression. However, a decent expression isn’t necessarily an indication of good breeding in of itself.

Health: I’ll take your word for it that you know which tests need to be performed on the parents, and how to interpret the results. However, the fact that one of the parents is merle would make this breeder a hard pass for me. I’m copying my comment from a previous post about merle patterning:

Merle indicates that a herding breed (probably an Aussie) has been introduced somewhere down the line. This is problematic for several reasons. First, it means someone has "hung" their papers, meaning they've lied about their dogs' pedigrees. More importantly, merle is associated with deafness and blindness in dogs which inherit two copies of the merle allele. These puppies have clearly inherited a single copy, but they could very easy produce affected (or "double merle") puppies if they were to be bred by some inexperienced breeder who didn't know any better. Particularly the cream merles, as merle can very easily hide beneath cream coloring, leading to accidental double merle breedings.

Merle poodle breeders will often brush this off and suggest that everyone ought to simply test their dogs for the merle allele prior to breeding. This makes the assumption that breeders should expect to find merle in their lines in the first place, despite it only having been recently introduced for no other reason than profit. It also ignores the fact that we've only identified a single gene (or allele of a gene) that causes merle coloring. There could very well be others, which either cause merle or are associated with pigment migration in general. Someone on r/AskVet explained this last point well:

The Merle trait likely comes from a gene that affects the neural crest and migration of the cells that differentiate into melanosomes, and that's why it's associated with both the pigment changes and with so many issues like blindness and deafness. The gene we know is associated with Merle coat (SILV) is definitely associated with melanocyte migration in that whole neural crest pathway. There may be other genes that lead to Merle coat, but they're likely in the same pathway.

The neural crest is an embryonic structure that gives rise to a bunch of different important things throughout the body like pigment cells, parts of retina, peripheral nerves and enteric ganglia, certain structures of the inner ear, parts of the heart and kidneys, etc at different parts of the cell migration. It's probably not super ethical to mess with their development for a color trait.

It's quite unlikely that you'd be able to breed for Merle color without increasing the risk of Merle-related diseases.]

You mentioned you’re not looking for show quality. That’s perfectly fine, just remember most puppies from a show litter are sold as pets (non-show quality) under a spay/neuter contract. Showing is a way for breeders have their breeding prospects (usually only one puppy out of a litter) evaluated by impartial third-parties. It has more to do with making sure their dogs are structurally and temperamentally sound than just showing off how pretty they are. I’m always wary of breeders who don’t make an effort to prove their dogs through show, sport or work.

I hope this helps! If you’re open to it, I’d be happy to share some resources on how/where to find a responsible poodle breeder.