The tv is too high, the art should not extend past the unit. The art is ok where it's at, move the unit to center it on the art. Take the flowers off the unit.

I would move the white insert boxes to create more symmetry...either all boxes on bottom row or create a square with four boxes in the middle section and one on top and bottom on either end. Use empty boxes to display books, travel momentous, etc.

I presume moving the TV is not an option, or at least not an easy option. What bothers my eyes is the fact that the two white units are not centered under the TV. My recommendation is to center one white unit under the TV. If there is enough wall space to the right, place the second white unit next. In effect just move the two white units to the right. Next, relocate the children's photo from the right and place it under the photo on the left. Align the top and bottom of the two-photo arrangement with the top and bottom of the TV. Move all the rest of the wall art to above the second unit. Maybe, move the small blue table to the left, under the children's photos left of the TV. Consider painting the white units black, including the boxes, which will make them appear more integrated with the TV.