In general, the first two Blu spawns are very bland (the the third, which houses both Blu and Red players is fine) in the fact that you hardly know that it is Blu territory. The first spawn room is fine, but the little setup area for Blu uses a drab, grey, NEUTRAL color scheme. This is bad! I'd suggest a more blu-ish color. For instance, some of the 2fort color schemes come to mind (the big, blu, non-accessible building on the right of the blu fort if you are looking at it from the red battlements has a terrific texture you can easily use). The second is brown, and while it fits with the building, it doesn't fit with the theme of Blu's forward spawn (Blu's forward spawn in badwater is all Blu themed, even though it is in Red territory). I'd suggest a bluer texture, maybe the one you have in that Blu shack that is in Blu's setup area.
More picture specific solutions:
At the third spawn for red (before the third point is capped), players spawn facing here and don't often know where to go originally. I'd suggest placing a dynamic arrow here that shows up here until Blu caps the third point, and then it disappears (and nothing replaces it).
Place a resupply locker here (this is in red's final spawn).