A neologism for “picture” appearing in ABNW (ABNW) from the early 2000s, based on ✱ken-mā < √KEN “see”, more literally “something seen”. I think it is better to use attested emma “✱picture, image” which was published after the neologism was coined.
Quenya
emma
picture
cemma
noun. picture, (lit.) something seen
emma noun *"picture" (compounded in indemmar "mind-pictures") (PE17:179)