Paint Tool SAI

I know that they have answered the question before me, but I would recommend using GIMP. I tried using Paint.Net, and to me it was the most confusing. Of course, I am just naturally confused by almost everything, but I have learned how to use layers on Gimp, and my renders come out nice. For examples, you may check my gallery if you are interested. Honestly, I use a mouse to make the lines, which is very hard to do unless you have a steady hand.

no, no is my vacations from Brazil! and I'm learning the language of you, I tried to learn a little google translator, and decided to ask a question, but really I'm from Wisconsin

Here is my answer from some other question:
Then try some free alternatives. Like:
Paint.net - http://www.getpaint.net/
GIMP - advanced one, can be bit confusing for new users - http://www.gimp.org/
Sumo Paint - runs entirely on your browser - http://www.sumopaint.com/home/
HeliosPaint - http://www.heliospaint.com/
Pixia - http://www.snapfiles.com/get/pixia.html
PhotoFiltre - http://photofiltre.free.fr/frames_en.htm

These are some good programs. Sure at beginning they might be bit confusing, but do not worry, with practice you will get used to them.

you a brazilian? '-'
so you talk " presiso " ( i'm brazilian too -q )