my lights turn off at 9pm...around 7 my hammer starts to shrink down from about softball size. By the time 10pm rolls around, he is about the size of a goftball and all sucked in to his calcified skeleton. It mayyyybe has about a half inch of fluffy tenticles sticking out of the top of his skeleton. If I remember, Ill grab a pic tonight.
Your pics look completely normal.
I have 18 hammers in my 90 gallon reef. They all start to deflate 6-7 PM. At first I thought something was wrong but I guess that this normal for hammers.