So my thing is that I hate stock head shots. I rarely commission head shots anymore because I always want for a fuller image, and even when I do, it's a custom of an obscure character so that it feels like it's "mine" in some respect. I once knew a fellow who got a head sketch of Jesse Custer from Steve Dillon that said "Cheers," only to learn soon after that it was entirely his default piece, with probably hundreds or even thousands of that same "cheers" drawing out there in the world. Why would I pay for an original photocopy, y'know?
That said, Neal Adams is one of the greatest artists in comic book history, and his style informed Michael Nasser's on the '70s solo serial. I didn't get to see Adams on J'onn J'onzz very many times, and while Adams does a little bit of sketching at shows, time and expense are admittedly both major factors in getting one of those. If I was going to own an Adams original, especially one involving the Manhunter from Mars, my best opportunity was going to be one of his many pre-worked sketches available for sale at his sprawling con set-up.
This particular piece isn't dated, but it was on yellowed paper with the Morrison-era "JLA" logo that may very well have dated back to that brand's heyday in the late 1990s. Frankly, that was a motivating factor in my finally picking up one of the pieces, since I'm very nostalgic for the Magnificent Seven period that represents "my" Justice League. At the time, I think it was the only J'onn J'onzz in his book, but I've found others when I've visited his table since. I did make a point of comparing them, and while similarly positioned, they vary enough in size and style that you're still getting something of a one-of-a-kind, plus I like mine best.
I'll also confess, I was hoping that buying a piece would butter Adams up for a very brief interview for a specific project that I had in mind, and somewhat to my surprise, he actually agreed. That was a funny experience, but perhaps one for another time...