Photography is a unique art form which requires both talent and training. You need not be a natural-born photographer, but you do need a willingness to learn and the determination to persevere until you find what works best for you.
Keep things simple when you are trying for a great shot. You can take great pictures without changing your color or motion settings to produce a beautiful photograph.
Try not to capture an overcast sky in your pictures. Your pictures can appear dull and lifeless if you have too much gray sky in it. Black and white photography may work better if you must shoot into an overcast days. If it is a nice day outside, you can show as much of the sky as you want to, but make sure you are attentive to the lighting.