Okay, I did what you said lazurus and it didn't make any difference, Then it hit me (And broke my jaw) I can just render the 512x512 then enlarge it in photoshop, Can't believe i didn't notice this.
Anyway, Completely remade the texture(with it enlarged), It looks better. Still need to blend the wall with the roof and the floor with the wall.
I think for the competition I'm going to make a model pack. This is 36 Polys, I was thinking about a 6 Poly road, 6 Poly path, Up to 50 Poly building, 6 Poly office block, Up to 60 Poly bridge, This model again but with a bridge on top, Up to 30 Polly Pillars, 4 6 Poly walls, Up to 50 Poly pizza shop And Maybe some other things. It's going to be a Urban city pack
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