https://www.domestika.org/en/courses/1668-naturalist-illustration-with-ballpoint-pen

Explore ink techniques using a ballpoint pen and learn to master line work to create eye-catching shadow, light and texture Can you imagine creating highly detailed illustrations full of textures with just a ballpoint pen? Graphic designer and illustrator Ricardo Macía has mastered ink techniques to the point where, by simply changing the amount of pressure, he can create different patterns that transform into light and shadow and produce incredibly realistic results. In this course, learn basic ballpoint pen drawing techniques applied to naturalist illustration. Work through a series of exercises and practice creating gradients, volume, and contrasts by controlling the force you apply in your line work. Then, create a composition with elements of flora and fauna and combine the realistic texture of ink with digital color in Photoshop to produce an original illustration.