Whatever type of art you are creating; there is demand for digital art nowadays. It is important for artists to have software that can edit photographs, create art from scratch, and manipulate sketches. Although there is much free drawing software, they aren’t likely to provide what you need. Professional programs may also be beyond your budget. However, there are some programs that are not only cheap but also provide powerful tools and features.
Autodesk SketchBook
Developed by Autodesk, SketchBook Pro is one of the most user-friendly software available for PCs. It clearly show the existing drawing tools and it requires few hours of learning to acquaint yourself with its process.
Xara Photo & & Graphic Designer
Xara Photo & & Graphic Designer have all the professional features and tools to compete with much high-end art software. To use this software, you don’t need to be an expert. It is very easy to use. To familiarize with its interface, a sharp learning curve is not required.
Corel Painter Essentials
For an introduction to computer drawing, this software is a great place to start. It is for people who don’t want to pay too much for a program but want to create and edit professional-looking digital art
References
http://www.toptenreviews.com/software/multimedia/best-drawing-software/