Hi...
@bonzo
take a close look at the colour temperature of each of your photos
I also do not see too much sharpness in the pictures, to me they seem all out of focus.
What type of lens do you use and what are the settings of your camera: ISO, Shutterspeed, apperture (diafragma)
Do you work in full automatic mode, do you use manual settings for shutter and apperture, or a setting with shutter priority or apperture priority?
All important things to consider when taking pictures.
Maybe you should try a setting with shutter priority, let's say a speed of 1/1000 and let the camera compute the apperture.
It's just a suggestion...
Grtz.
Zipper.
Nikon D300, D700 & D3, AF-S 70-200ED 2.8 VRII, AF-S 24-70ED 2.8, AF-S 300ED 4.0, TC-17E II.