Besides making the watercolor artwork above, I also made the vector graphic version of the pink orchids using Inkscape. Creating a vector illustration is not as intuitive as drawing on a paper or painting on a canvas. However, the advantages of having a transparent background and the ability to export to png file in any size are two things which digital printing companies such as zazzle or redbubble need from our artworks.
As a matter of fact, it was my first experience using Inkscape. Now, it is available in my Tropical Art store on various products from T-shirts, to mugs and spiral notebook.