noun
adding detail to a drawing
Refers to the act of drawing in fine details, shading, or additional elements into an existing sketch or illustration. Often used in art and manga contexts.
下書きが終わったら、次は描き込みに入ります。
Once the rough sketch is done, I'll move on to adding details.
このイラストは描き込みが細かくて、見ていて飽きない。
This illustration has such intricate detailing that I never get tired of looking at it.
書き込み means writing in or filling in a form, or posting a comment online. 描き込み specifically refers to drawing details.
描く is the general verb for drawing or painting. 描き込み is the noun form focusing on the act of adding detail.
Compound of 描き (kaki, the continuative form of 描く 'to draw') + 込み (komi, the continuative form of 込む 'to put in'), literally 'drawing in'. The word describes the process of adding detailed elements into a drawing.