These are four characters from the Dungeons & Diversity line of tabletop gaming figurines created by Strata Miniatures that feature heroes in wheelchairs. Specifically, a human druid, elf rogue, teifling cleric, and dwarf barbarian. You can get a resin or metal figurine starting at £15 (~$20), or the 3D printing
This is a video of Emil of Squidmar Miniatures painting a knight figurine while dressed as a knight himself, slowly removing the pieces of armor as they hinder his painting like a medieval striptease. He’s a very talented miniature painter for sure, but I question his merits as a knight.