Stats Preview Card Component using Grid and Flexbox

My questions are mostly about the setup of the image.

NOTE: I didn't use any figma files, i've only use the given assets.

1. First question is about the color of the layer we apply on the image, how to found the good color to fit the desired design?
2. I see that something on the bottom of the image with the layer is wrong but I didn't manage to figure it out, so any feedback for this is really appreciated.
3. What is the most appropriate solution about the image to fit the desired design, i could reproduce it but i'm not really satisfied about this, so I would love hear any recommendations / advice for it.