/ic/ - Artwork/Critique

Sketches have three main advantages over lineart for beginners

>undefined lines means your mind picks out the one that looks the best
>amount of lines suggest depth
>lightness and boldness variance of the lines suggest depth

Lineart strips away all of these, and the replacement techniques are harder to master and require more knowledge and patience. However if you're not planning to render, color, or shade the drawing, I see nothing wrong with a respectable sketch, even the best clean lineart can look dull and flat sometimes.