A fairly standard pose, fairly well executed.
The shutter speed is not particularly important if you're using studio lights, as the brevity of the flash should freeze most motion, but it's the lighting which let's it down a little. The light on her near arm is way too bright, causing an almost posterised effect, whereas her hair is blending with the background. Unfortunately, the background is lit slightly and you can see different areas of tone, perhaps the edge of the backdrop?
Even if you want a dark feel, you still need to bring the model out of the background, usually by adding a small hairlight, or a reflector to add a very small amount of hair detail.
From the shadows, it looks like a large harsh light to the right at chest level, with a weaker fill to the left, and also the same height. The ratio is a bit too much, hence the blown arm in front, but nice shadows behind, so with this set up I'd suggest dropping the aperture to f/8-f/11, perhaps more. It's easier to tease out shadows than blown whites. You might also consider dropping the power of the key light by a stop too.
The background can be sorted in ps, but lighting more carefully should obviate the need. Just by turning the light away from it can make a big difference, especially with softboxes, and you also get to use the 'feather light' near the edge of the light's coverage, which is softer.
Little details are the key once you have the basics. Eg the creases in her skin behind her shoulder...easy to clone out, but that's one of the things that good models learn, to make the shapes but still keep the skin taut. It might feel slightly uncomfortable, but it looks better, especially around arms, shoulders and neck. Just by rolling her shoulder forwards slightly, those lines are eliminated, skin and material are stretched and the shoulders have a strong line across, rather than the slightly hunched shape you so often see.
Small details, but a good effort.