I found a wonderful free
software, called GIMP 2.
It offers a lot what Paint.Net does not have. If you download it, check out it's filter menu and you'll see sooooo much more options you can do with the pictures compared to Paint.Net.
I still love Paint.Net and will use it fequently, but to have both of them, I'm very happy.
I do not own a Photoshop software, however, I was told this software offers almost everything that Photoshop has. I'm not sure if thats true but from what I've seen, I love it!!
Its FREE!