https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Melee_Armored_Skeleton

Appearance The melee armored skeleton is seen having two variants. The weaker variant wears a scale mail chestplate and holds a single dagger in reverse grip while the stronger variant also wears a scale mail chestplate but with an additionally reinforced mail helmet and holds a sword.

Pixels size (For Skeleton And Weapons): 9X9

Pixels size (For Armor): 10X10

Note for the armor I had to scale the armor 1 pixel higher so it could fit on the skeleton. if I scaled it the same as the skeleton, it won't fit.