Very good and clean builds. From the pictures, I don't see any issues on the basics so you would surely make the first cut, and be a "contendah" if I were judging. Thing is, in most contests, you have to deal with what else is on the table in your category rather than strictly on the quality of your build.
Good luck and let us know how you did.
And regardless of anytjing else, have a great time and don't be afraid of approaching other modelers. We love talking about our stuff in person even more than we do online.