Any of those will do, it just depends on what results you want and what you're most comfortable with. I personally use Photoshop because I'm comfortable with it and can do the style I want quickly in it, but I could get equally good results in any of those programs.
<-- Meet Seith. He begins the story as an apprentice druid, learning to survive in the wilderness by communing with nature and honing his herbalism. Seith has a deep desire to understand the world around him. When wells of chaotic energy begin erupting from the land,corrupting plant, animal and man alike, Seith finds himself on a journey to discover just what this means for the fate of his home, the land of Myarr.