I have to admit that, on the 1,000-pixel JPG, Ar Men is a really tiny little speck on the horizon, between La Vieille and the Goulenez lighthouse on Sein Island (the black and white tower). It is barely visible as is, and only marginally better when looking at an enlarged version of the JPG, for example in FastStone Image Viewer. On the original TIFF, you can see it quite clearly and even distinguish the black and white markings.
Here is a 200 percent crop: