What is negative space?
Negative space is the space surrounding your subject in a photo. To make it really simple, it's generally just all the empty or unused space in your photograph. In fact... almost every picture has some negative space but it's not every image that uses the negative space as a dominant element of the composition.
I often find comments about getting closer in photographs and I know... sometimes they have a point. But many times it's just that the viewer doesn't understand what he/she is looking at. That may sound rude but let me explain that before you judge me...
I just love using negative space to bring out the details of anything or just to make calming surroundings to a simple subject. I find that in photography many people don't understand the power to it... or maybe it's just that many don't just take time to relax and let the image speak to you in that way. I also find most people nowdays are enjoying photography as, well, as fast food... :/
Many images with a lot of negative space don't give such "wow" factor and people just skip it. And of course, it's just not appealing to all. So it's not like you are stupid if you don't get it. ;)
But nevertheless... What I'm trying to say is...
Take your time and let the images speak to you.
Photography isn't fast food!
Some of my photos with a lot of negative space:
One birch tree
breath of fresh air
Walking on ice