Try to sketch with blue pencil. It could be just very rough sketch. Then use drawing pen to draw over the sketch. My sketch usually so simple, it contain just the main shapes of the object. The details (curly lines, pattern) is addition that just comes. I think my work will messy when I sketch the details. Thats way I only sketch the main shape. Hope its helps.
I'll try this! Thank you! My big problem is that my draw usually became tooČ small, so I start to focus on detalis like bowls ou acessories, never patters, pecause once they're not big enough, I need to use a 0,1 nankin pen to finish them.
But I'll try sketching like this and observe how it comes