This technique of painting fur is relatively new to me, so it's not perfect-I'm still trying to figure things out! But in the meantime, I will show you my current method of painting fur!
Step 1: I use 2-4 brushes for painting fur. They are both Wet Flat Brushes, found on the Medibang cloud-i.e. if you have Medibang, you can download the brushes for free.
The first brush, Big Boi, is used for blending which I will explain how to do later. These are the settings. The most important setting of this brush is Colour Mixing Level. I actually like to have Colour mixing level closer to 90, but you do you.
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The second brush, Details, is for, you guessed it. This brush is for the hard lighting and shading you will have to do, and will be the most important brush you need if you want to make your fur look like fur.
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Step 2: On your drawing, you want to lay out your flat colours after line art, like so.
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Step 3: I like to select the fur, copy it, then paste it on a new layer so the colours don't mix with the other parts of the drawing. Once you do that, you are going to do some simple lighting and shading. I make two seperate layers, one on multiply and one on add, and I clip them to the fur layer with the flat colours.
On the multiply layer, you are going apply some basic shading. It doesn't have to be perfect, because in the end, it is all going to blend together. Remember that fur is a 3D object while doing this. I used a shade of purple for my shading.
After that, go to the add layer and apply lighting. I actually use a fluffy pastel brush with Compliment at 70 and Colour Mixing at 30 to apply both the lighting and the shading.
Once I am finished applying all of the lighting and shading, I merge all the layers together, and then using a second fluffy pastel brush with the colour mixing at 100 and at low opacity, I simply blend all of the lighting and shading.
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Step 4: This is the hard part! It may take several tries to get your fur just right, and even mine isn't perfect. So now, you are gonna take the Details brush and simply draw out the fur shape with a lighter colour, most likely the colour you used for the lighting. Depending on the subject, it will be shorter or longer.
After that, you will take the Big Boi brush and blend it. It can be hard to get the hang of at first, but one you do, it will be a breeze.
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Step 5: Some extra notes: Remember that as the subject moves farther away from the light source, the light will be less direct, and the farther away you are, the darker it'll be. Also, if you want, you can add little flyaways. I forgot to, but you can if you want.
So after you repeat step 4 several times, eventually you will have a nice fuzzy lad!
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If you guys want a more in depth tutorial on how to do fur, I suggest you watch this video by Clockbirds! She's much better at explaining this kinda stuff in depth lol.