Self portraits are hard, most times it ends up being a best guess on lighting. In this case, the lighting set up looks good, maybe move it a hair more toward camera axis, but overall good. I'm not a fan of shoot through umbrellas, because of the light scatter. A reflector gives you more control over the light direction, and less chance for reflections off other bright objects.
Exposure, needs work. Though I have the Black Mist filters, I'm not a fan of them for portraits. They work well for their intended use to soften bright background lights, and help keep them from blowing, but they tend to cause softness issues and washed out colors on portraits. That might well be some of the contrast issue mentioned in the above post. The big thing as evidenced by the histogram is the lack of correct White Point and Black Point setting.
Notice the lack of data in the deep shadows. That can affect more than just the shadows, it can cause bright colors to appear washed out. Adjusting them will cause the image to pop. In addition, try these settings
Luminosity Curve and HSL panel
Adjustments to the Blue channel in curves.
In addition set your sharpness to around 40 and masking
to 70. Put the focus back on the face with a post crop vignette of around -9. After making the above adjustments, this was the histogram.
At this point it becomes a matter of tweaking settings and dodging and burning.
On pose with your build I'd rotate the body more. Doing so creates a flattering slimming effect. In this day and age of all the gender talk, I'm almost afraid to say it, but there are tried and true generally accepted Masculine and Feminine that are generally understood by portrait photographers to refer to a pose containing certain basic elements—much of it relating to the direction the subject’s head is tilted. In the masculine pose, the head and body are turned in the same direction and the head is tipped toward the low (far) shoulder while keeping the head at a 90 degree angle. I know sounds difficult but it isn't really. Suggested reading on posing and portrait photography is Monte Zucker's Portrait Photography Handbook
Amazon product ASIN 1584282134 He breaks it all down is simple to understand methods.