As I did an orchestral submission myself, it is really cool to see other orchestral submissions as well. The main theme really does well as a main theme, kind of like an introduction to this fantasy world of different guilds. Very classic RPG sounding to me. I do think the mixing could have been a little better as mentioned, but understandable as you worked on these tracks for short periods of time. I found that the struggle for me in making orchestral pieces only using samples and programs is how I could make it sound as realistic as possible. Of course, I think one can only go so far with that without playing the instrument straight up haha, but I think you did great with all of the tracks!
My favorite of the three guild themes would probably have to be the assassin's. I like the instruments used here, but I usually am partial to Asian-style instrumentation haha :)