Don't. Especially not NSFW comments. When sending payment through paypal or other payment provider, don't add comments unless asked to by the artist. Especially not NSFW ones. This risks them gettin...
Close your eyes and imagine an apple. On a scale of 0 to 10, how detailed is it? 0 being you don't see anything at all, 10 being super detailed. https://youtu.be/ewsGmhAjjjI?si=JAv5bedYph23J963