/ic/ - Artwork/Critique

Ok can someone help me with values and where my fuck ups happen? I notice personally that I very often have issues with the background and can never get the values right. I want the backgrouds usuall to be low detail with low contrast so they wouldn't steal attention but they either become a blurry mess, too detailed and strong, or just too desaturated in a way that it doesn't even look like it belongs to the picture. I think this illustrates my frustration well (don't get caught up in the anatomy shitty perspective, I just made something to illustrate my point.)

What should I study to fix this? Any resources and advice is welcome ofc.