Regarding Dwarf Slayers Games Workshop has had a long tradition of coming up with several sculpts. I started out with the era of the Slayersculpts around the time of the 2nd Blood Bowl edition and their brethren in Warhammer accompanied us for quite a long time. Then there came only two new sculpts for Mordheim which had slightly downscaled facial features and smaller hands. Then there came only one plastic Slayer which was the first sculpt I didn’t like that much. And now as the Age of Sigmar and the Fyreslayers are upon us I doubt that we’ll get to see improved new plastic Slayers from GW.
So what can a Dwarf do if he intends to include Slayers to his Throng? Given that you would like to have them look like the rest of the Dwarves. The Mordheim design would have worked but only two different sculpts for a whole unit does not sound like a good idea.
I found the answer over at Avatars of War. I ordered their plastic Seekers, painted one of them and was quite happy with the result how his design was a good fit next to one of my other dwarves. His facial features might be a tiny bit to small in comparison but his whole frame is pretty convincing.