Thanks nas for your suggestions. I am posting a revised version for your consideration.

Revision

The view is one of rare and ineffable beauty
as our plane passes over the Himalayas.
Mountains, enveloped in dense forests
embroidered with meandering rivers and streams
exude the soothing radiance of green.

The sky is a panoramic show of clouds 
appearing in myriad forms:
layers of vapor surging forth; 
fluffy balls floating around 
or nestling against mountain peaks; 
a goddess majestically looking down; 
and soon, 
a lion looming through the mist. 

All at once, the show climaxes: 
it's clouds and only clouds crowding the scene. 
They look like mountains of snow outshining 
the real snowy peaks they now hide; 
as they hide everything else: even the blue sky 
peeping out through chinks.




Original

Glancing out of a plane's window can be fun
as I was to experience on this flight
passing over lofty Himalayan ranges
which, inspiring awe by their continuity
presented to my wondering gaze
a scene of rare and ineffable beauty.
The mountains, enveloped in dense forests
interwoven with meandering rivers and streams
exuded the soothing radiance of green.

In the sky above was going on 
a panoramic show of clouds
appearing in myriad shapes and forms;
now as layers of vapor surging forth
and now as fluffy balls floating around
or nestling against mountain peaks.
They reminded one moment 
of a mighty lion looming large 
in the distant horizon;
and another, of some Greek goddess 
looking down.

All at once the scene changed into what seemed 
a fairyland of clouds, encircling us on all sides.
They seemed to be mountains of snow 
outshining the real snowy peaks
which they hid from view;
as they hid everything else:
even the blue sky
scarcely visible through crevices.