Some scorps are difficult to identify, I only know the most commonly offered ones, a couple of better pics may help. Scorps are very often misidentified, how big is he now, do you know where he came from. Reef scorpionfish is a common name that is loosely used, it is meant to be the Caribbean scorpionfish(Scorpaenodes caribbaeus).
Here are two different barbfish(Scorpaena brasiliensis), the first one came in as a reef scorp, but after it grew more than 4", I new it was a barbfish. They are very similar, another fish that will sometimes get thrown into the mix, is the spotted scorp(Scorpaena plumieri), but this fish is actually very different. The 2nd pic came in as a barbfish, and in the 3rd pic you'll see they will eat a fish much larger than should.
You will all of these fish may come in brown or shades of grey, but when they are in a healthy tank, eating healthy foods, they will turn shades of red and orange. Click my name and "find all threads" and check out some of my threads on nutrition.