Well, in that specific question there are couple of issues that you may or may not be aware of, so lets try to fix them:
The features/characteristics you are looking for are way too common!
I seriously doubt any image editor (and correct me if I'm wrong) doesn't have any of the characteristics you are looking for. Those are kind of basic functions of any image editor. That is true for the first 3 features you are looking. Any software will answer your question.
"Is easy to use" for whom?
This is a rather subjective matter. People learns at different speed, YMMV. What is easy for me due my upbringing, previous knowledge or aptitude could be too difficult for you. So prefer not using something that affects each person differently as a requirement it should fit.
So I should add more characteristics?
Ideally yes, but in this case no. Your characteristics are most of the time a given when you are looking for software of that kind. So you must look for some distinctive feature most of the software doesn't have or you think doesn't have and swap out the previous ones.
If you have tested anything at all put the characteristics that you liked/disliked in, that would help to narrow the scope to a handful of answers but at least you are being more accurated.
But if I do, it invalidates some answers...
That was the risk the answerers take knowingly or unknowingly when answered your vague questions. Comment them about the changes in the restrains and inform them that their answer no longer applies due X or Y reasons, allow them to update their answer with another solution or wait for them to delete it.
If some time passes and you feel the answerer hasn't take care of the matter, flag for a mod and explain the current situation.