So, the picture is a classic condensation pattern on a window. A dirty window, as it turns out, since the water hasn't condensed evenly. In fact, I'd recommend you get your window seals checked, because you're wasting electicity.
I'm not going to refer to this as "Mary" or any other name, since AFAICT its a blob of condensed water. I'll call it a "her" just because.
My first thought was that you were presenting the big oval shape as her mouth and the dots above as eyes, but that would make "her" look more like a cartoonish ghost than anyone's mother. As you're presenting the oval shape as her entire face, I can only say that she has one hell of a jawline, or perhaps that's part of her neck. We only have a lopsided oval to work with, I'm confused.
The circle to the right is curious, its certainly part of the image, but has no identifying arrow. Is it way more distinct than the "cross" you've pointed out, but you don't tell us what's coming out of or missing from her neck/shoulder in this picture. The dripping water make this a disturbing addition to the scene.
There's also a big white blob to the upper left of her head that's interesting, mostly because its not water vapor. Not connected to the body, so I'll just move on.
The "icon" you mention is awfully big, don't you think? You label it as a possible book, but its three times taller than her head! That's a big tome to be lugging around. Plus its also dripping with something.
Honestly, even if Mary or some other iconic religious figure was appearing in some form, I would really expect a clear and more obvious form, one that wouldn't draw scoffs from anyone even slightly skeptical. I mean, water vapor will disappear in seconds given the right temp/humidity and what you have is condensation of a window. Not really a rarity. Plus, I'd hope that an appearance would involve more than some tiny group noticing. You and yours might be well deserving of some boost of faith, but wouldn't a more public manifestation be of greater value to the world? How many people are going to benefit from this in your bedroom?
