Wikipedia says it doesn't.
However, iCloud it self say it does
Your photos and videos are using 1.1 GB
If you want to stop using iCloud Photos
Wikipedia said:
While Photo Stream uses the iCloud servers, usage does not come out of
the user's iCloud storage allowance
Okay looks like there need to be some form of explanation
Best Answer
Yes - this aspect could potentially be a little confusing. There is a difference between iCloud Photo Library and PhotoStream and backed up photos and videos.
Photostream
iCloud Photo Library
Backed Up Photos
More general information.