A pic of the front wouldn't show much except for the printed image.
Well that's kind of the point...
If it's thin and luster-y then it's probably either Luster or Semi-gloss. I don't recall off the top of my head there ever being a thin version of luster, but there is one of semi-gloss (170gsm). However, sometimes sheets come in different weights than the rolls that i'm used to.