Most professional pixel artists i know (or follow) use Cosmigo ProMotion. Some use GraphicsGale and other programs but the general consesus is that ProMotion is one of the best. (especially if your making tiles)
But if your doing it for fun just use ms paint or one of the other free downloadable programs such as MT Paint, GIMP, Paint.net, Timanthes (great for wide pixel and C64 restrictions), etc.
But if your doing it for fun just use ms paint or one of the other free downloadable programs such as MT Paint, GIMP, Paint.net, Timanthes (great for wide pixel and C64 restrictions), etc.