Cool fog pictures, this one as well as the "Khyber pass" one.May I suggest you add some feathering to the masks to smooth out the edges, since they are now clearly visible in both pictures.Just a small tip, unless you wanted this effect of course. :-)
“The ability to think differently today from yesterday distinguishes the wise man from the stubborn”
In this picture (magnified) they are clearly visible as a dark line around the bottom half of the pole, and also to the left and right where the foreground meets the background.
I'm no expert on photo editing (maybe someone else can help?) but I usually just add a couple of pixels feathering to the mask: Mask > Mask Outline > Feather..., or if it's an object not a mask; Object > Feather...This usually helps to fade out the sharp edges and gives a more natural look.