I suspect they consciously make a special effort for the first few days to help reassure parents when they first leave their little ones, and, once you have been leaving them for a few days, it falls into more of a routine.
When you say 'sent pictures' - by what means ? Were they printing them ? Or e-mailing them to you ? Or do you have one of the systems such as Tapestry where you can log on and have a look at things the staff upload ?
Also, how old is your little one? If Under two, then he will be in a staffing ration of 1 adult to 3 children, and also babies sleep more, so staff have more time, whereas if older, the ratios (and activeness of the dc) mean the staff have far less time to be uploading or printing or attaching pictures regularly.
Generally though, if a child is non verbal, you usually get more information (eg what they have eaten) in one form or another - there are so many different ways Nursery put this information out to parents though, not one 'correct' way.
Ultimately, they should do their best to find a level that works for both staff and parents though. Not having any communication for two weeks seems strange. Do you not ask when you collect ?