Here’s an ~800% scale of part of the image where it shows. I hope it does not loose too much during conversion.
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Grease pencil generates a lot of vertices. And all those vertices introduce again a lot of data to give the line a body to Render.
Basically, you need to clean up the grease pencil data vertices with more fluid line motion. Less noise, which can not be solved by adding more samples.
Cycles samples, say something about how many light rays are used (calculated) to build up the image. Less sample the noisier the image becomes because Blender Cycles has not enough data to build the images. White pixels, pixel noise. The more samples you use, the better the noise is recalculated.
But it comes with a cost. It is time-consuming! Heavy CGP and GPU maths.
The latest trend is using a denoiser, which becomes currently very smart (because of AI used). It’s used in gaming hardware with ray-trace capabilities. With a few samples, you can get a realistic render. Good enough for fast-paced games.
But Blender has something new and that is Eevee. It doesn’t use rays to calculate but is based on rasterization. This is how most game engines work. With Eevee, you have a better path for game development.
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dreadlocks
Good idea though.
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