Corona 1.7
V-Ray 3.60

In the archive: max 2014 Corona + V-Ray obj a folder with textures a library of corona + v-ray materials.

In materials in section BRDF there is Microfaset GTR (GGX) if your version is older than 3.1 then choose Blinn Phong or Ward – which is preferable for you.

For close angles to the bouquet you can apply Turbosmooth to 1.