Let me put it this way.
If you are directing a wedding scene in a movie and it is suppose to be a happy scene, would you shoot while it is a gray day and raining? Would you light the scene with harsh bare bulbs? Would be dress people in a macabre black? Would you tilt the camera to give strange skewed angles? In post would you give the scene a cold blue color treatment? Would you ramp up the contrast to crush all the quarter tones into black? All of these things would be fighting against the idea of love and joy.
Some examples of easy things you can do:
•For intimate feeling portraits, get close to the subject and use a shallow depth of field. We only see people in this way in real life when we are really close up to them (an intimate distance) and our visual focus is especially shallow, much like a shallow DOF on a camera lens. Hold your hand two inched from you face and focus on it. Everything else blurs out to an extreme degree.
•Warm color temperatures give images an emotionally warm feeling to photographs, while cooler color temperatures invoke a feeling of emotional distance. This isn't always true, but it does work most of the time.
•Extreme low angles looking up give the subject a feeling of superiority while looking down at a subject can give a feeling of inferiority. This probably comes from when we are children and constantly looking up to powerful adults. And we look down at children or perhaps physically weaker people.
Every decision you make will contribute towards a reaction in the viewer. If you are just starting out, go slow, and ask yourself 'why' constantly in regards to whatever you are doing. Show your images to artistically articulate people for a crit. People are going to see different things or feel different things from your images. But overall, if enough people's reactions are close to your intent, you can feel happy about the clarity of what you are doing. Just because you can't measure these things like stones on a scale, doesn't mean they don't exist, or you cannot pursue creative excellence. Every great artist or creative professional I've seen has worked their a$$ off to get to where they are. Talent will take you only the first few steps on a mile long journey. Every great artist has an enormous amount of mediocre work in a landfill somewhere, work they produced that was either just unsuccessful or they were trying to figure things out.
-----------------
If you want to see some amazing photography with clear intent, go to:
Browse the Book :: AtEdge
This is the best of the best American advertising photographers. You need to be accepted by them to be listed and it costs about 10K a year. It's a physical book that goes out to the ad agencies around the world, but it has an online version that I provided the link to. I chose this link, because commercial photographs NEED to meet emotion and intellectual goals or it's a waste of an incredible amount of money. They need to make you think and feel a certain way about a product, person, or idea. Not all the work is 'wow' but if you scan enough pages you'll see what I mean.