Without a pre-planned composition nor a selected colour palette, the subconscious freely guides the paintbrush". His education and years of experience in painting naturally influence the final effect, giving the works a distinctive style.

Since the beginning of his artistic path, a recurring theme has been Bartek's use of faces. This theme originated during his studies while working on self-portraits, and reproducing expressive faces, of anger, pain and hurt. He draws inspiration from, among others: the work of Edvard Munch, Pablo Picasso and Stanisław Ignacy Witkiewicz.