3D tools and applications provide wide techniques to model your character and transfer it from concept art to 3D model. When it is important to learn different modeling techniques to be able to reach the best method to model your character. For example, you can choose to use 3D tools such as 3Ds Max or Maya which provides wide 3D solution for your project or use modeling specialized applications such as Mudbox and Zbrush.
No need to create 3D architecture scenes any more when you can get free 3D architectures Models and scenes from the web. This will help getting your tasks done fast and much easier than doing every thing form scratch.
One of the important steps when working with interior 3D design is to collect a good resources library from 3D models to use in your 3D scenes and designs.