My first though when I saw the cover was “that’s the worst album cover I’ve seen for a big label release”. But if you look at Steve Miller’s other covers, they look like they were made for five dollars or were made by deranged graphic designers. Jeesh Steve could you put a little money into your albums designs?
Maybe he knew that by 2011 album cover art would be smaller than a postage stamp and thus there was no need to spend time or money on it.
What’s a postage stamp?
That’s a lion. 
Back in the 70’s, i used to watch ch. 22 on UHF. They showed alot of Japanese live action and cartoon shows like Speed Racer, Kimba the White Lion, and Johnny Sako and the Giant Robot. There were several superhero shows too, including the original Power Rangers, and a bunch of similar shows, with costumed heroes and rubber-suited monsters. This costume is the hero from one of those shows, but i can’t remember his name. It was one of my favorites at the time, and i wore this costume three Halloweens in a row, even though it was already too small after the first year. If i ever recall the the name, i’ll let you know.
Rolling Stone ranked it in their top 100 Album covers of all time.