In addition to his work for Steinbeis, Liedl is a self-taught painter and is fascinated by the impact of color as part of a dialog with different shapes. His focus lies in the harmony between color and form. Harsh geometric shapes, peaceful in themselves, interchange with dynamic strokes of the paintbrush, motivated by intuition. Liedl often works with color transitions, from almost monochromatic varnish transitions to powerful color compositions. His pictures have featured in national and international exhibitions since 2007.