Photoshop may now be the most common people use, retouching to do graphic advertising design, painting can be, but the strongest or retouching, it can be said to be the world's most powerful plane software.
coreldraw, freehand function is almost the same, said the professional layout can not fully explain its role, I feel the most performance of its function is: they are vector graphics (hook line is very good).
illustrator whether you are the production of printed publication line designers and professional illustrators, artists to produce multimedia images, or the production of Internet pages or online content are suitable
I hope to help you. The one you're looking at was done in Coreldraw, I think