Geez. Well, those websites (for your mare before you bought her, and for the stallions you are considering) give the IMPRESSION that the Vanner breeding community could not give a flying fig for conformation (since next to no attempt is made to enable the viewer to SEE it) and that color and pomp and flying hair are the main things being bred for. ("Silver Lining" especially. It's all head-shots and action shots! Sheesh)
If that is the case and it really *doesn't* matter what shape a foal turns out, then what the hell, breed for color.
If you want to keep the foal for yourself and DO care how it's built, or if the fact that next to no attempt is made to display conformation does not mean that Vanner buyers are all *that* uninterested in the subject, then I would say that OF what I can see of your mare, width may be the main thing to focus on improving. (Although honestly there just aren't any conformation shots of her, plus with all them feathers who even can tell what her lower legs and feet are like).
If you want to work towards a somewhat wider-bodied foal, you need to not only pick a stallion that is somewhat distinctly broad in the chest and hips, but also that consistantly THROWS good-width foals. I have slow dialup and am not going to wait for a hundred shots of picturesquely flying hair to load, but you really SHOULD, to see if you can get a sense of what each stallion is producing. (Obviously this is not independant of what sort of mares are put to them, but at least you can see what foals are produced). I would be leery of breeding to a youngster with few grown offspring yet, if you are really working to correct a conformation thing that is not always obvious before maturity, and I notice that at least one of the stallions you're considering is a younster himself.
I am still not sure what you are breeding FOR? (Like, what is the top priority?)
Pat