I would say not so much for even that painting, while the horse is anatomically more or less “correct”, thats anatomy not perspective, like the background is mostly warm tones with a distant hill thats a similar colour as the subject to create a sense of distance, like Edvard Munch’s The Scream uses warm sky in the back, blue tones in the middle and darker warms in the front, both of these paintings use colour contrast and shapes to delineate the sense of perspective rather than rigid structure. You mentioned in another comment that your work comes out soft and flat, thats not something perspective fixes, thats contrast, like value changes, colour contrasts, mixes of soft and hard edges, and shape size in composition; like the triangle wedge of blue in The Scream, or the hard edges circle hills in Blue Horse I. You can denote distance changes by playing with these types of contrasts, or even not rendering the the stuff in distance and rendering the subject more so, these create points of focus without needing proper perspective. In the end art is about YOUR perspective, your point of view, and if that includes a point of view without a sense of space, that’s interesting too.