If you upload the resulting images on your website which we assume is a photography website, you must provide credit line for the original images and mention their source and author. You cannot claim full copyright for the resulting images as you will have used other authors' elements (backgrounds and pieces of furniture).
The resulting images may also be sold as prints for instance should your clients want to buy them but such usage would require you to download the images under an extended license. Again, you cannot claim full copyright and providing credit line is highly recommended.
Under no circumstance can you re-sell or license the resulting images as your own entire creation.
We recommend you contact our support service link here
for more details.