The overall size of the scene is indicated

Render created in Corona 6.
Materials in Vray were converted using a converter.
For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR.
If you're using a V-Ray version earlier than 3.1, be careful: the BRDF section in your materials will show Microfaset GTR (GGX). If your version is older than 3.1, the BRDF field will be empty. Choose Blinn, Phong, or Ward—whichever is more convenient for you.

The penultimate preview is in PNG format on a transparent background, suitable for creating a collage.

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Wildflowers, wild flowers, autumn grass, autumn flowers, dried flower, dried flower, dry grass, dried grass, dry foliage, dry leaves, autumn, field, meadow