A proper lighting is always at the top priority when creating a harmonious scene.

There are two commonly used skills: realistic and dramatic lighting. For architectural visualization, we prefer the image/animation to look as close to the real world as possible. Thus natural sunlight is a good choice.
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Luckily, you can use Geo&Sky system in D5 Render to simulate the sunlight in any area at any time with ease and pleasure. Just input the location ( longitude, latitude) and time (month, day) info, then D5 Render will create the sunlight you want automatically.
Of course, you also have HDRI available to get an actual lighting distribution over the scene.

You can control the position of the sun by time, date and geo position. Offset angle can be changed by North Offset as well.

Intensity determines how bright the sunlight will be, affecting the contrast between light and dark.

Geo&Sky is especially helpful when you want to create a twilight scene like this:

Set the time to evening, which ensures correct color temperature and shadow length.

Then adjust North Offset, making sure the building's main facade faces the sun, so that it can be properly illuminated.

Here is an example of how NOT to set the sun. When the sun is on the side of the building, we can see that the whole building is shrouded in shadow, thus losing many details and looking blurry.

In order to create a relaxing and cozy vibe for this twilight scene, we can pull the Sun Disk Radius higher, making the shadow edge as soft as possible. This step can prevent confusion between twilight and noon. To add a tint of romance, you can turn on clouds which will look pink and purple under the influence of sunlight.

Now you can see how Geo&Sky has improved the quality of the whole image.