I don't see dunskin. I see just bay dun. The first picture with the flash being used makes it look almost like dunskin, but the bottom two definitely don't. A buckskin dun would be creamier, but he is a "flatter" color.
Definitely not a dunskin that's a bay dun. Here is my dunskin they are much lighter and creamier because they have two dilution genes. As you can see there is a big color difference. He is a darker shade of dunskin even than most others I've seen. A lot of the dunskins I've seen in person are even lighter than this.