She looks so lonely =(

Nicely done!

I like that subtle little glow around her edges!

Very nice. I'm wondering if the opacity of the heavy white ghost layer was lowered a bit if it would look more ghostly?

Here is one i did of a ghost in the mirror. (need to do something about the plant in front though).
Had to cut a little of the bottom part of the mirror and place it over the ghost figure.
Its all a matter of cut and paste here and there....a little perspective tool too.
The white spot on her face is actually showing thru from the back wall, couldnt fix that unless i used curves on it maybe.

The images would have looked alot better if they were touching but, oh well next project. =)

I think it's really good. It looks right to see the background showing through and Idon't see a problem with the flowers unless you wanted the flowers that are actually reflection masked a tiny bit.

after paste you may experiment different modes

"Screen " (alone or enforced by another dup in same or in overlay mode) may often create a very ghostly effect