Those two photos are brilliantly composed, and the lack of color contrasts in them highlights that strong composition. Converting them to black and white will reveal the amount of textural detail in each image. Right now our eyes are more focused on the subjects and how they look against their backgrounds.
By "lack of color contrasts," I mean the tan one doesn't have screaming-to-be-noticed blue or purple or green in it. And the blue one doesn't have any orange or red or yellow in it. Each image is nearly monochromatic. The first image's dominant color is tan and its nuclear family members. The second image's dominant color is blue. In both images, versions of its dominant color move up towards white and down towards black.
When I taught painting, one assignment I'd usually do was to have my students compose their painting of a still-life using a nearly-monochromatic color scheme, with one dominant color but embedding "nuclear family member colors" into the color scheme to add visual energy. They could choose any color they wanted to dominate their paintings. It was a good learning experience for them. They had to isolate the light-and-dark in the real world they were looking at from the colors there, and then make the volumes in their paintings look real using those lights and darks embedded in another color family.