How to get back pictures fom Icloud

I have enabled Icloud Photo Library and optimized Iphone Storage as well. But then I did was disablw the Icloud Photo Library and it asked me that all the low resolution pictures on my phone will be lost and I clicked Yes! Now almost 90% of my pictures are gone but when I checked Icloud.com I can see all of them are there. The question is, how can I get back those pictures to my iphone without having to restore from an Icloud backup? Why wont it download the pictures when I enable ‘download and keep the Originals’