There are several ways, and some are better than others. This discussion is a rough outline of the three main ways. It is not exhaustive, but it should help you get a sense of just how often specific styles come into play:
General: the drawing style you do when you’re sitting at a computer on your own, in isolation. The technique you do for all your characters, creatures, etc.
Foil: when you try to look cool but you aren’t sure if it’s gonna work.
Struve: when you’re doing your best and want someone else to see how your style feels.
You really don’t have to do everything in each of these three styles – what would be different about them? What about all your characters might be different? Which style work best for an action game? Do you like to do black linework and call it “gameplay”?
And so, after you do a quick google search for the drawing style you want, look at some examples of your own artwork. This should help you define how it should look from two angles. What sort of shapes are you trying to draw and what sort of elements are in them. Do you draw the elements a specific way? Or a different way? When are you trying to do a specific thing and what do you need to achieve that? Is your style an interesting visual element, or a gimmick? Does it give you something to look at, or does it take away from what you’re trying to do? Is it easy to spot, or do you need a lot of practice to get the hang of it? Does it look like something that someone would use or would want? This sort of thing is really important, and can tell a good designer a lot about their subject matter.
This is what I mean by developing a style. Sometimes one style might work on an action game, but not others, and they can’t all be good. Don’t stop at just one style. Pick a bunch of different styles that compliment your interests and use them as a filter to see what looks good.
So, in conclusion, there is a really easy way for a game designer to identify a style or three and know what to use. Don’t worry too much where you start and stop. Do as many things as you like, in any style that gives you the best look you can. Look at your own work to get an idea of what look is right for yours, and look for those style cues
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