Other things which would need to be taken into consideration

• who's the image for
• what the image is for
• what your trying to put across
• what age group are you aiming it for
• the environment / surroundings you are in
• is the image for a magazine, if so will the image require space
• composition
• mood

So much requires thought, but should come naturally with experience and practice, even just walking into a situation without your camera and looking at where you are, the available light, the direction of the light, the colours etc.