So let's begin building our illustration.
I will create a square document.
Now it is time to choose a brush. I choose - 221 - you will also have it for download.
Now let's set the way our brush will react to pen pressure or pen tilt. I just love Digital media for such opportunities. That with only one brush you can create lot of different effects.
Here are my brush settings:
Remember that every new brush option will "eat" your Ram.
Now let's see how we can use our brush. I've just made several strokes with different pressure and tilt.
Now I'm still thinking that my picture here is a little bit Planar and 2d. Let's make a new layer between the 1st we've created and background. Paint with the same brush, change only the background and foreground colors.
I will try to do something with what I got right here.
First I will overlay it with a gradient in layer style box (just click x2 times on the layer itself).
The layer mode here is Hard Light.
Then watch the Screenshots carefully.
I will create a new (top) layer and overlay it with gradient.
The Blending mode here - Multiply.
Here is our current result
I've also created a layer mask to my background layer and have hidden upper parts of the effect. 
When you are done with that you cam just merge the layer down, leaving only with 2 layers. 
Let's distort the image a little bit. For this i will make a selection. 
Further it a little bit and use a twirl filter. I'm having an area selected so the filter will effect only the selected are. 
Filters>Distort>Twirl. 
I will use one of my favorite Plug-ins for Photoshop. Kay's power tools: see even the name sounds cool; recommend.
I will use Equalizer. 
We now have a little bit of blur effect. 
It's not so important but I've created a mask and exposed the effects only in center of my image. 
And we are basically done here with Wacomania illustration. Enjoy, practice your colors and shape feeling. 
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