M..
I would take a soft cloth and carefully pat the pictures dry then I would leave them in safe place to sit for a few days to completely dry.
For the pants, I would use ( Tide with color safe bleach ).
I have to say, I'm 33 and I spill stuff often.
It bothers me when my husband yells at me when I spill something because I know that when it happens it was an accident.
I have never done it on purpose.
So please go easy on yourself and your children and know that it was not done on purpose and its not the end of the world. It can be cleaned up.
I really do hope your pictures come out ok.