One moment while I pick my jaw up from the floor...

These drawings are excellently executed, complete with clever perspective, correct shading and balanced compisition. The drawings have a illustrative feel to them and the likes of book publishers and also (for example) Weta Productions in Wellington NZ (Peter Jackson's crowd) should know about you. I would encourage you to make some contacts with the likes of those and further your art career - that way you get paid a great deal for doing somethins that not only are you good at but which you enjoy!

Indeed a natural.