Ania Sorting Photographs

We have granddaughters staying with us this week and Ania decided it was time I got "organized".  I thought I was - I had them in a pile here, a pile there... basically I knew where they were.  But, now I will have labeled boxes and files so there will be no doubt where I can find them.  We're both a bit confused - where do you file a picture of a girl standing in front of a tree holding a purple flower? -  nature, portraits, trees, flowers, purple flowers, or leaves?

PS Don't tell her but there are probably 6,000 photographs (I have 20,000+ digital)...maybe we should count them?