Hello, I don't know what you do. If you are a college student and just want to express your design ideas, I suggest you use a marker because it is convenient, quick and expressive. Nowadays, hand-drawing is mostly based on a marker, supplemented by colored lead in the sky, glass and other places. Of course, the three have their own advantages, watercolor has a strong sense of hierarchy, and colored lead is concise and lively. If you want to show the final effect, then watercolor is better, after all, more rigorous and more textured. Note: the marker should show a sense of design, don't paint too dead, just don't paint watercolors, be patient. Colored lead is more of an aid, but it is not very effective as a main tool.

I hope I can help you. Say hello if you can't explain clearly.