Digital art is probably the most workable medium around, (next to acrylic painting in my opinion), though speaking with experience it's not as easy as it may sound.
For anyone who doesn't know how the process of digital art works, here's a little brief-over:
You plug this fancy little thing into your computer, it's just a tablet (this is the one I have, it's called a Wacom Bamboo Capture)
The tablet responds to the pen's touch just like a normal pencil on paper would; the harder you push, the thicker the line. I use a drawing program called Painttool SAI, which starts you with a blank canvas and from there you have a color palette and a bunch of customizeable 'brushes', and as shown on the right side there are layers (think of layers as transparent sheets of paper stacked on top of each other. If you only want to work on one layer without affecting the work on the other layers, you simply select the layer to work in.)
From there, magic happens and you can get really amazing, smooth, clean results. Here's an example of a digital piece I did a while back, it's more Doctor Who art :)
Rose's Doctor
1) Sketch - Start with a loose sketch first to get the general idea and feel down, then refine the sketch a bit to start creating the base of the lineart. (FYI the watermark is a username from an art website, in case you're curious.)
2) Lines - I created a new layer on top of the sketch layer (imagine putting a new transparency over the sketch and tracing over that sketch in Sharpie) and used a solid black brush to get a solid outline of the characters.
3) Basic Color - I created another layer, this time
under the lineart layer (this way the black lines will be on top, and if I get color underneath them, it won't show up) I zoomed in and added basic colors.
4) Color Lineart - There's this fancy little tool you can use that allows you to change the lineart from black any other color. In this case, black looks to startling against Rose's blonde hair, or their pale skin. So, I took a slightly darker version of the base colors the lines are touching and colored over the lines. See? Looks more natural, easier on the eyes.
5) Shading - We'll get into shading techniques another time, but for now just take a slightly darker version of the base color and using a low opacity setting on the brush (opacity refers to how transparent a color is. If the opacity is low, you will have to use several strokes of the brush to get the same saturated color as a single stroke on a high opacity.) When I shaded this, there wasn't really a specific light source since they're kind of floating in space, so I just shaded the wrinkles in the clothing and other places light doesn't easily reach. Just by simply shading the piece looks more alive.
6) Background - Your characters don't usually float in white space (then again, they don't usually float in space space either... but this IS
Doctor Who.) For the background on this particular piece I used a bunch of different brushes and opacity levels and colors until I got the desired effects (it takes a lot of messing with, there's no real trick to it) then I zoomed in and added tiny white dots for stars. I did a few other technical things to touch it up, like color editing and adding that light blue line around the characters so they would pop out. When you think it's done, take a step back and examine the details.
Digital art definitely takes some practice, it takes a little getting used to for sure, most artists aren't used to looking forward at the computer screen instead of looking at their hand while drawing. Once you get the hang of it, it's super fun to mess around in some drawing programs, you can do so much that traditional art doesn't offer, like overlays and effects and oh, the lasso tool! But we'll get into that another time...
Anyway, thanks for reading, hope you like the finished piece! Don't hesitate to comment or ask questions.