I'm going to take some artistic license with this answer since it seems to me that is what the OP is looking for.
For the benefit of literary aesthetics and depending on mood, I would recommend:
to scatter by or as if by sifting; sift sugar on a cake
I could see my vague reflection on the misty window sifting my surroundings.
or,
to be diffused through
I could see my vague reflection on the misty window percolating my surroundings.
or,
to make soft or softer
I could see my vague reflection on the misty window soften on my surroundings.
Other possible options are: Deliquesce, Relent, Yield, Surrender, Cede, Relinquish, Concede