Find the 1024 x 512 in https://skins.minecraft-moscow.com/en/ or https://www.google.com/search?q=minecraft%20hd%20skins%201024x512&tbm=isch&hl=en&hl=en&tbs=ic%3Atrans&ved=0CAIQpwVqFwoTCOCjnIiumOoCFQAAAAAdAAAAABAC&biw=2481&bih=1369#imgrc=U9Oq6avr3quNeM&imgdii=nUGI-XyHuwfTOM by copying these links.