Steve, I would say continue to do both. I base that on not only the obvious fact that you are very accomplished in both mediums, but also that it would seem some lighthouse lend them to one media rather than the other based on structure type, location and season for example a winter season with trees with all the leaves gone, pen & ink.

I like the brick lights in pen and ink, while the white tower types I think are better in color in some cases. If the location is an ocean beach, then I would want to see color regardless of tower type.

Whatever you decide, keep on creating as God has blessed you with a great talent.