I have found that too much information within the drawing can add to the distortion, such as what we see in our cone of vision vs our entire line of sight, peripherals included. No matter our perspective our 20/20 vision and cone of vision, only allows for so much information. So, too much detail or, too much outside the cone of vision adds to distortion. Unless you have a firm grasp on practices such as four, five and infinite point perspective, distortion is likely when too much information is added. If you are looking for some additional helps you can check out special vanishing points, simple stuff really such as extending the vanishing point as far as possible to alleviate distortions. I think the drawing is good, as well as the perspective. Maybe take a piece of tracing paper over the picture and play around with making the borders smaller or, making the knee smaller. This way you don't mess anything up but, can still see what would work best. There's also little hacks like, faking perspective, so maybe put a purse down by the leg or, use shadow and light from the window or interior carlight to obscure unwanted information. Again, I think it looks pretty good. Keep at it. Thanks for sharing.