I think you've got the concept down. What program do you use for the white parts of the lightmaps? If you have PSP or Photoshop, use an airbrush, or (at least in photoshop) you can use the filter Render>Lighting and it will make like a spotlight shine on the black part, which when you apply as a lightmap looks like a spotlight lighting up part of the ship hull, like you did with the left "wing". You'll notice that the placing of those "spotlights" is important, and that you can easily go overboard and have too many of them. Like anything it takes practice to do well.