Didn't take a pic, but the bathrooms are very nice with a double vanity, separate toilet in a room with a door, large soaking tub separate from the shower and a large walk in shower. We got a strip/pool side room a few weeks ago (no resort fee) and were very satisfied.
If you do a search on YouTube for "M Resort Las Vegas Room Videos", several videos pop up. Here's one for a Double Queen which looks nice...
Oyster is amazing with providing detailed, borderline excessive (but in a good way), high-resolution photos. Here's their profile for M: https://www.oyster.com/las-vegas/hotels/m-resort-spa-and-casino/photos/ Gotta say, I've checked this place out before online, but checking it out again I can't help but marvel at just how spiffy this resort is! My next Vegas, whenever that may be, I'm planning on staying only at new-to-me hotels... I've got a bit of a list going, but this got added to it. Hope you'll do a trip report!
I am looking to actually having a somewhat UPSCALE stay this October trip, away from the Strip. I can only hope, that by late October, all the bars and restaurants, will be open. I spent about 2 hours here on Aug 3rd, but just in part of the casino. And saw where the spa was. Need to check out their prices too.