Hello,
I received some GMK sample keys from Emir, and took some pictures to show you. Here is the imgur album:
https://imgur.com/a/qnEBE3J.
Here is the most important image, which shows the alphas in the back, with the 1-4 gradient keys in focus:
Some notes on the images. They were taken with an iPhone XS camera (I know, not the best), natural lighting, no post editing at all. The keyboard in photo is a Blackblue Matrix 1.2OG. The other keycaps are GMK WoB.
Initial thoughts- Color matching looks good, especially on the main alpha colors (pink and deep purple). The 1 key is off from renders, but works quite well in the gradient. I personally don't find this to be an issue because of how it works in the gradient.