Thanks everyone for replying! You're all helping me a lot! 
@jmhenry Yeah, I really need to revise my planning, and advance some pages to work without too much pressure to publish the pages.
@AngieVX In this case I think you did right...
@shazzbaa I enjoy working with these details but I don't just do it because it's fun, it's like I need to make all the pieces to fit in and complete all the system (make the world more "realistic"). It's really compulsive.
@jutawi These ships are hard to draw, but it's one of the essences of the story. I love it.
@Bloomer Yes, create worlds is awesome, I'm still thinking in doing a novel about some of the protagonists of my comic. But I have a problem. When I'm writing a story, suddenly I get a new idea for another one, then I get stuck with two unfinished works.
@vincentprendick Your comment gave me an idea. Sorry, I don't know how to explain... but anyway thank you so much. PS: Your series "Tapastic 101" is helping me a lot too! ^^