They "look" ok but I know its hard to tell if you don't know what you are looking for.Check the teeth on the cassette too. You could change chain and see if it behaves with the cassette
personally I just get the LBS to change both when I start getting issues with slipping and whatnot
I was under the impression that if you changed your chain before 0.75 then you should get a couple of chains out of the same cassette. We shall see I guess.