How do authors make graphics?

[Layback_]

Hi all,

This time it is more like a generic question about graphics than programming.

How do authors create their own graphics?

Like all the authors do, I also try to put same value on graphics as much as I do on programming. However, I've never learnt anything about graphics or even a Photoshop. Thus, only thing that I can do is using resources from the web or packages like this.

I'm not saying that they are bad, but I can't fully show/express my individuality and originality.

So, I would like to ask how addon authors create their graphics.