For creative professionals, an online portfolio can become your most powerful marketing tool. It communicates your skillset and exposes your work to countless potential clients worldwide who are looking for someone just like you.

But that’s all contingent on it being done well — and better yet, with brilliance. Despite the number of talented web design professionals and easy-to-use portfolio builders available today, the number of poorly presented portfolio websites online is astonishing.

To uncover the most common mistakes made with design portfolios, I chatted with the Lukas Dryja, Co-Founder and Creative Director of online portfolio platform Format, about the most frequent pain points he comes across and how to avoid making them yourself.