In light of your additional comments (originally in relation to shroud):
I want to convey the lightness or vagueness of the reflections over the surroundings. It's not another layer over my surroundings. Rather it just blends with it, very nicely and very subtlely. You don't even notice it if you don't look hard enough.
I offer tinge and bleed over (or bleed into) and have combined them into one answer, preserving my earlier suggestions that led to these two:
verb: tinge; 3rd person present: tinges; past tense: tinged; past participle: tinged; gerund or present participle: tinging; gerund or present participle: tingeing
- colour slightly. "a mass of white blossom tinged with pink"
- permeate or imbue slightly with a feeling or quality. "this visit will be tinged with sadness", "his optimism is tinged with realism"
noun: tinge; plural noun: tinges
- a trace of a colour. "there was a faint pink tinge to the sky", "the light had a blue tinge to it"
- a slight trace of a feeling or quality. "in their sound you'll find punky tinges and folky tinges", "a tinge of cynicism appeared in his writing"
This gives:
I peered through the window with the slick navy blue curtains, swinging to and fro to the movement of the minibus, blocking my view to some extent. I could see my vague reflection on the misty window tingeing my surroundings.
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verb; gerund or present participle: bleeding
- (of a liquid substance such as dye or colour) seep into an adjacent colour or area. "I worked loosely with the oils, allowing colours to bleed into one another"
- PRINTING (with reference to an illustration or design) print or be printed so that it runs off the page after trimming. "the picture bleeds on three sides"
Leading to:
I peered through the window with the slick navy blue curtains, swinging to and fro to the movement of the minibus, blocking my view to some extent. I could see my vague reflection on the misty window bleeding over|into my surroundings.
noun: shroud; plural noun: shrouds
- a thing that envelops or obscures something. "a shroud of mist"
verb: shroud; 3rd person present: shrouds; past tense: shrouded; past participle: shrouded; gerund or present participle: shrouding
- cover or envelop so as to conceal from view. "mountains shrouded by cloud", "a sea mist shrouded the jetties"
If you want to avoid the "double -ing" (from shrouding and surroundings) you could use the noun form: "...vague reflection on the misty window, a shroud on my surroundings."
noun: veneer; plural noun: veneers
- a thin decorative covering of fine wood applied to a coarser wood or other material. "a fine-grained veneer"
- a layer of wood used to make plywood.
- an attractive appearance that covers or disguises someone or something's true nature or feelings. "her veneer of composure cracked a little"
verb: veneer; 3rd person present: veneers; past tense: veneered; past participle: veneered; gerund or present participle: veneering
- cover (something) with a decorative layer of fine wood. "a veneered cabinet"
- cover or disguise (someone or something's true nature) with an attractive appearance. "he exuded an air of toughness, lightly veneered by the impeccably tailored suit"
Using the "attractive appearance" / "disguise" sense, somewhat poetically, you could have:
I peered through the window with the slick navy blue curtains, swinging to and fro to the movement of the minibus, blocking my view to some extent. I could see my vague reflection on the misty window, a veneer on my surroundings.
(Using the noun form seems more natural here, although you could have "...vague reflection on the misty window verneering my surroundings.").
As an added bonus, you get some alliteration with "vague".