Nobody wants to venture a guess on your damsel here. I figured this one would have been easy. If no one else ventures a guess soon, I'll see if I can't dig it up myself.
I think it is just you and me for now, I was waiting to see if any one else chimed in. I like your choice, the Dracula shrimp goby (Stonogobiops dracula) very Halloween.
Okay, it is a Pterois russelii, called the plain tail firefish or the Russell's lionfish, here is how I tracked it down, from the shape and finnage I could tell it was a lionfish which is in family Scorpinedea, When I checked those I saw that the lionfish with the long fins and jaw frills are in genus Pterois, there are only 6 in the genus, only two are mainly white with narrow bands, the russelii and the volitans, the volitans has long eyebrows and a moustache, the one in the picture does not. So that leaves only the Russell's lionfish which has at least 8 common names. Here is your fish, and the volitans, if you look close you can see the long black eyebrows and lip tendrils on the volitans.
Try this one, it is also a scorpinedae, but not often seen in private aquaria, it is fairly rare so mainly public aquariums have them, it has a couple color phases but the general pattern remains the same.