digital image from my studio
If you decide to paint with colored inks, be sure to determine whether you care about archival quality. If you want the color intensity to last for many years, then go with lightfast inks. Traditional inks are transparent. Acrylic inks are slightly transparent, but can be made to cover over the color underneath. Each of these has different characteristics, so be sure to read about how they are made, and perhaps try a few of each to decide what you prefer. I always use archival quality materials, because I put a lot of work into my ... work! and I want it to stay colorfast for many years.