Digital Painting Considerations

Bringing concept art into the digital medium brings about a whole range of variables and considerations with how to produce and present the art. The key word here is 'choice'. Painting digitally gives you tremendous amounts of choice, while reducing time, effort and mess that might normally have to be endured with traditional mediums.
One of the more obvious differences between traditional painting and digital painting is the lack of actual paint.

Digital painting provides palettes and swatches without having to mix paints. It allows for precision colour selection in seconds. Many digital painting programs also include a colour mixer where you can digitally simulate traditional mixing of paints for those who are more comfortable with traditional mediums.
Another benefit is canvas size. In painting software, you can have massive canvases for printing at any size. The maximum size of your canvas is usually constrained to the processing power of your computer.
However, one of the biggest considerations with moving to digital painting is the brushes you use. They are important not because the right brush is essential to a good painting, but because it's something many digital artists obsess over. There are some brushes that have benefits for traditional painters. For example, you can simulate the tilt of a traditional paintbrush, which alters the appearance of the brush stroke. But the biggest danger when learning to paint digitally is to get too focused on custom brush shapes.

These shapes are often designed to make the painting process quicker and easier, and gives you texture without spending more time layering paint strokes to do the same thing. While this is useful to the seasoned artist, a beginner may start to rely on custom brushes to produce the effect they want. This may hinder overall development as an artist. Many professionals recommend using either one brush of any shape and just sticking to that one, or just using the basic round brush which comes with programs like photoshop.
This all doesn't mean that digital art makes traditional art redundant, or unimportant. But digital art is nearly essential with its time-saving properties, which the games and film industries rely upon.