Yes, it does look like that marbling in the crime scene photo is the same marbling shown in the first bleeding photo.
The location of JA's foot, whether right or left, is off just a little bit in the sketch on the crime scene photo because the bleeding photo shows her foot is on the other side of the grout between the tiles.
To me, it still makes the most sense that the big foot in the foreground is JA's left foot. Her right foot would be in the other side of the camera. If the camera is on the ground, it would be her right foot kicking it to activate the camera button. Or, under my theory, that positioning of her feet shows how JA could still be holding the camera in her right hand.
Any chance you could create a sketch depicting the feet the way I have imagined?
It should be possible to identify the brand of jeans JA was wearing and determine whether the stripe is on the inside or outside of the leg. If the stripe is on the inside, then that's JA's left foot.
Thanks for the great insight as usual, Dave!