Lumion is a great software for your exterior renderings. It has awesome specifications and It's the best software ever made for fast photorealistic renderings. You need it because it's fast, you don't need to know a lot of thing about the 3D software usage.
You don’t need to texture archive for renders because Lumion had a great deal with Poliigon and other texture creators. Also, It has own model archive inside. In the Pro version, you can reach thousands of materials, object, effects and sounds.
In this tutorial, we showed you how to create a road, and how to change textures of models and how to add different texture in the scene and prepare a scene for renderings.
There is a great free alternate of it – Twinmotion