While I don't know the artist , but never the less like the work...an edition size of 1450 AND 100 Artist Proofs ...for a photo mechanical lithograph....is not all that limited to begin with ! Unless the artist is Freakin famous I'd peg this print at no more than $125 framed as it is. You'll have to find a Gallery that deals in his work , ebay sold items, or any auction houses that may have sold his prints in the past.
Here is his site. http://www.journeaystudios.com/js/ EDIT Secondary market... calling these numbers might get you some info, too. https://www.rareartfinder.com/print/philip-j-journeay-thunderhead-yosemite-50713.htm This result is for "Thunderhead Yosemite", not "Thunderhead over Yosemite", but hopefully still will be of help.
