The black wedge shaped trapeziums don't seem to be even, is that how you intended them to be? The black at the top is different widths, which makes the whole image more unbalanced, in my eyes.
The borders of the image are all different lengths because I pulled out one side at the top more than the other in an attempt to get verticals vertical. As a result, there's no way I can get equal sized black wedges whilst conforming to an 'over all' rectangular frame. The wedges are the same width at the bottom but different widths at the top. I admit I've complicated things a bit by doing this, so now I'm not sure if you don't like my image because,
(1) It's not symmetrical.
(2) I've chosen a black matte which might be too stark.
(3) I've chosen a wedge shaped matte to complement the wedge shaped image when in fact an equal width matte on all four sides might look better, or even no matte at all; just the shape of the image mounted on foam core, or perhaps even an oval shaped matte.
Or maybe you just don't like that image period.
There are lots of ways one can experiment with the basic concept of getting away from the 'square' paradigm. We seem to live in a very square world; square shelves, cupboards and computer tables in square rooms with square windows in square houses. We write letters and print photos on square pieces of paper, read square books and stare at square monitors and/or TV sets.
All these items are square for good practical reasons. Igloos and wigwams are not
square, also for good practical reasons. Our cherished motor cars are also not square for good practical reasons relating to aerodynamics.
My trapezoidal image above (trapezium is not the right word; my mistake) is merely a suggestion of possibilities.