
Muriel G. answered 10/17/20
Professional Archaeologist Teaching Social Science from the Ground Up
The problem you are running into here is that there are several ancient kings in several ancient places associated with the King Midas myths. Most of these kings and stories substantially predate even the Trojan War, and finding any portraiture from that period depicting specific people rather than idealized forms, let alone ones we can positively identify, is pretty rare. If you're really set on having a picture of a possible King Midas from that period, Dr. Lynn E. Roller is the expert on Phrygian imagery and you can look up her articles for inspiration and open source images, but it's likely that you'll find pictures of a generic guy in a Phrygian cap, which is more strongly associated with other meanings besides the Midas myths. I recommend you pick the most striking royalty-free image you like rather than going for accuracy for your cover photo.