Hey there! Pretty, first of all: I am drooling over the Tobiano! It would be helpful if you could add what you intend to use these horses for, are they geldings or stallions, and what breed, if known?
I do not see any conformational flaws sticking out, the solid horse's neck is a bit short for it's thickness, and he doesn't seem to have very good withers. As of legs - the way he is standing that is hard to tell.
The tobiano (he is gorgeous!!!) may have an overbite, I would check his teeth. He may be a bit splay footed in the front, too - again, could be the way he was standing for the picture. It really depends on what you are wanting to do with them to know which parts should be "taken apart" more - which would be the job of somebody who knows more, I just look at a horse in the "is it well enough put together to fit my needs"-way. And "does it look pretty while doing it"
When it comes to competition you want to be way more picky.