Special K

That's an excellent image, thanks a lot for posting!  Us observers really need stuff like this to understand what we are seeing in the eyepiece.  I've recent had another shot at this area under moderately light polluted skies and NGC7536 is always what jumps out at me. In your image he is just above the claw and provides the most contrast between bright object and dark background. 

The bubble itself is huge!!!  I was looking for something smaller which might explain why I felt I could see nothing. 

Goodness I can make out the double cluster in this photo! Amazing