I took two photos a couple of years apart on similar (but different) films and developed them slightly differently. However, I am surprised at how much difference there is in the grain. Can anyone help me understand what is going on please? The first shot is of my wife in a hat. Kodak Tri-X rated at 400. Developed in D-76 stock for five and a half minutes at 22 Celsius. The second is of my wife and son. Ilford HP5 rated at 400. Developed in D-76 1:1 for eleven minutes at 20 Celsius. Both had similar agitation: two inversions every 30 seconds. Both were taken in low light with an Olympus 35 RC. I would normally expect more grain from the Tri-X but it is clearly more finely grained here and I prefer it. Can anyone shed any light on the differences? Thanks!