i love the roof tiles Tom , but the textures definately needs some weathering to bring it to life .
Overall pretty accurate to the reference ,if i had to be picky i would say the the two rows of bricks above the arch need to be either a little further apart or slightly thinner because the gap between them is a little small and the detailed texture that needs to go in there might look a little over crowded as it stands.
Great job so far though .