I would agree with the other commentor about dynamic contrasts; bright as opposed to what? I get the impact you are trying to portray but perhaps some punctuation would emphasize it better. 

"sky, pure nothingness...
bright. Bright. Bright."

Punctuation can aid in hitting main points hard while softening others. Overall I like what you are doing with it.

Thank you for the advice! I tried changing it to "bright meadow for miles", thoughts on that and the rest of the poem?

This has some imagism vibes to it. Very cool. I do agree with the other commenters that the image should be more precise given the fact that the whole poem is an image. 

I would recommend reading someWilliam Carlos Williams and H.D.

Here’s a poem in particular that you seem to have some kinship with, here

https://www.poetryfoundation.org/poems/48186/oread

An image of complete whiteness as you call it. I don't think you can do that with just images. I think proper use of abstraction could actually bring the poem to life. An image this pure needs some emotion to fill in the visual gaps. For example, bright meadow for miles is good and all but I think 'for miles' adds anything to the poem. I hope this is't rude but maybe something like his would work:

silent, still
fleet of snow
becomes sky, pure nothingness
bright meadow, no orientation
you could float here forever

silent and still     
fleet of snow flows into    
sky, pure nothingness     
bright meadow for miles   
you could float here forever    


- 
I tried to create an image of seeing complete whiteness, such as closing your eyes and seeing only that. i'd really love some feedback, thank you!
-
https://www.reddit.com/r/OCPoetry/comments/82requ/young_boy_stricken_please_give_me_some_brutal/dvcjd2h/?context=0
https://www.reddit.com/r/OCPoetry/comments/82qfnn/processtxt/dvcix2g/?context=0

white noise

I tried to create an image of seeing complete whiteness, such as closing your eyes and seeing only that. i'd really love some feedback, thank you!