The first two shots look obviously underexposed. To be more precise, red and green light may be properly exposed but blue light is underexposed. Even when you shoot print films, there are some occasions you have to consider the color temperature of light on deciding the exposure seting in order to get good color balance in your print. You'd better open up at least 2/3 of a stop from the meter's reading when shooting under the early morning sunlight, at least one full stop recommended under the artificial light conditions (tungsten, flourscent etc). This rule doesn't apply to those films with immese latitude, though (like latest Portra series films which have wider latitude on the under exposure side than the conventional print films). If I were you, I would open up 1~4/3 stop from the reading of the meter considering the existance of blight colored wall behind her.