Sooty Buckskin or Dunskin??

Not a dun. Not genetically possible unless one of the parents was a dun, which Belgians are not and a dunalino would not produce that color unless crossed with a dark horse.
Looks like a buckskin to me

It's very difficult to tell from the pictures (they're pretty small) but I'd guess either sooty buckskin or sooty brown buckskin.

I think brownskin too.

Why would a dunalino not produce a dark horse? Agouti hides on red, so it's entirely possible for a palomino to be carrying At unbeknownst to anyone and if the other horse is black-based, you have an entirely possible chance of having a brownskin foal.

I believe you have a black buckskin.

What is a black buckskin?
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It's a name used for smoky black in the UK and in Australia. However, I don't think this horse is that colour.