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I'd say no less than 500 mush, but no more than 5 apples per headshot, in my honest opinion

I'm probably gonna buy one for my own avi

Are you planning on adding shading?

Without shading, I agree with Angel.

With shading, you could probably raise the prices a little more, as it adds a bit more detail to the art work, and it's more work on your end.

Help, I don't know how to shade.

Shading's fairly easy once you get the grip of it! Which program do you use? :0

I use ibispaint x...

Lovely :D

I've never really used it myself, but I actually have it downloaded so I have the interface ^^

I can give a few quick shading tips :3

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When you are on the layers for the artwork, you can see it says "normal" and there's a dropdown there - there you can choose different layer settings :)

Now there are a lot of them but the ones I use the most are Multiply and Add - Multiply for shadows and Add for light!

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The way these layers work is that you have the multiply- or add-layer as a clipping mask on top of the layer with your colours, and then you choose a colour to shade with. I usually go for a light grey-blue for shadows but it depends on lighting :D

I'd suggest experimenting with it a bit and seeing what happens, overlay and soft light are also great layers for adding some ambient colouring to a piece!
Hope this helps a little bit, please ask if you wonder anything! I'm always happy to help <3