Light: Illumination of the object of shooting is often far from ideal. Full-sized cameras are equipped with a large amount of toolset for eliminating this problem, but the matter is worse with the camera phones. It is hardly possible to take a good picture under conditions of bad illumination; the reason for it is - automatic shutter setting. The better illumination of the object is, the better will be the picture you are taking.
The white balance is usually corrected by doing the following:
Auxuto focusing: This facility is available in some mobile camaras like Soney Ericson K750i. In such phones the cama will focus the object automatically by half pressing of the camara button. After focusing the obejct as your wish by this way and compleate the shooting by fullpressing of the button. By using this technology you can selectively focus the object in a frame have multiple objects.
Most of the mobile camaras avalable in the market have this opetion. Try to use this options.
Modes: Now all mobile camaras have modes like micro, night etc. Night mode is elf explaninable. You van catch the picture in the ratio 1:1 by using micro mode. In this mode you can use the camara very close to the object to take its pictures. How much close you can use the camara in this mode that depends on the type of the lense. You can try with different modes to get best best pictures.
Normal/Fine modes: Some mobiles there are two picture mode options like normal/fine modes. The pictures taking in fien modes consumes more momery but its gives high quality pictures.
Avoid the Effects: There is the inbuilt picture effects like sepia, balck and white etc are available. Try to avoid to use such options, that you can be possible with photo editing softwares.