Compositionally it could be much stronger. Essentially now it has two picture-elements (the desktop and the painting on the wall), both competing for the role of “subject.” The painting appears dreadfully underexposed. The eye wanders across the screen … and wanders, and wanders some more.
The eye follows a path through any picture. It starts at the brightest spot. It’ll wander out the edges and fall-out of the picture if it can. It likes “rule of thirds” lines. It wants the path it follows to eventually be closed. There is a huge amount of material on photographic composition on this Internet.
For instance: http://www.seittipaja.fi/data/Photography_lessons/Composition/Lesson_1/_The_Rule_of_Thirds.html
(What, you might ask, could a tutorial on photography have to say about computer graphics? “Everything,” I would answer. It’s an image, isn’t it? Don’t matter by what technology that image came to be.)
So, the rendering notwithstanding, the picture itself can be made much stronger (just as if it were a photograph…) and you will immediately have a much more satisfying image perhaps without changing any of the models at all.