Another point I’d like to mention is scale. The scale of the elements in your design need to be considered for its intended purpose. If you are designing a print for a bikini the print scale might be smaller than the scale of the design if it was to be used for a maxi dress. A winning print design can be developed by hand using your favourite art mediums or created digitally using graphic software, but ultimately your designs will need to be finished on the computer to prepare it for print production.
