22 Sept 2022, 19:03

@Annabishop you're welcome!

CMYK is the color profile for print, and it can be very different from RGB. It might be a client's way of making sure that the file you're sending them is as close to print-ready as possible. It also gives you the opportunity to deliver the exact colors you intended, as there can be quite a color shift when converting from RGB to CMYK.

Adding to what @Nyrryl-Cadiz and @ArtMelC have said: this all probably depends on an artist's illustration process as well. Because I'm used to working traditionally, when I work digitally, I don't use a lot of layers. If l work on elements in separate layers, they all get flattened into one layer before I move on to the next step in my process. So it probably wouldn't do clients much good if I sent source files. I'm sure clients are used to hearing, "Sorry, I don't work in many layers," from artists with a similar process. Most bigger clients, I'm sure, are used to working with artists who don't supply PSD files, either because of their process or because they work traditionally.