For the Chevrolet and Cadillac brands the most challenging part of work was to learn all the guidelines and create art in this strict boundaries. Time after time I became one of the most knowledgeable people on this subject in our agency, sometimes I've even consulted account managers and interns on the guides.
For this brands we were creating mostly digital materials and I have learned a lot in how to design and submit work for landing pages, banner, teasers, social media formats.