I am still very much learning photography so the photos I delete are generally ones that I look back on and are just not all that great.

I generally don't look at how many favs a piece has when I do this. I've noticed some of my favorite photos have very few favs and some that I didn't expect to have many get a lot.

I was deleting off the least favorited photos, but I've gotten to the point where there are pictures at the bottom that I still like so I'm leaving them until I no longer like them.

Well its a weird way how things go here on deviantart. Sometimes i see really powerful pieces and they hardly receive a lot of views favourites etc. While a lot of the times i see pieces that and will say it nicely makes me scratch my head twice and they get so many views and favourites that it makes me think its a reverse world. Beautiful work gets pushed away by very very poor work and thats something that is sadly happening more and more. So thats why i leave my work were it is in my gallery and dont delete it. Its all personal preferences