Deleter Screen Tone Jr JR-403 [ Halftone Gradation Pattern 60L/5%-90% ] [Sheet Size 182x253mm (7.16"x9.96")] For Comic Manga Illustration

yeah freehand is definitely more beautiful. But if it is too time consuming or boring, a quick pattern might help you keep the contrast and the style, and focus on the more fun parts.Something like this: https://airsickstencils.com/collections/patterns-textures?page=2or this: https://www.amazon.com/deleter-halftone-gradation-182x253mm-illustration/dp/b01n0xa88rAlso the watercolors somebody else suggested are a strong option IMO.