Why can science fiction drawings be sketches? First of all, sketching is a basic drawing technique that can quickly capture and express ideas. Sci-fi often requires quick editing, creation and delivery of ideas, which can be accomplished more quickly and efficiently using sketching techniques. Secondly, characters and scenes in sci-fi often have complex forms and details, and the lines of the sketching technique can effectively express these complexities. In addition, sketching is able to emphasize the sense of volume and space of objects, which is important for creating a sense of realism in a futuristic world.
While science fiction painting can be sketching, it is not limited to sketching as a drawing technique. Artists can choose other painting techniques, such as watercolor and oil painting, to express the theme and emotion of sci-fi paintings according to their creative intentions and skills. So, sketching is a possible way of expression for science fiction painting, and it can also be a part of other painting techniques.