The archive includes:
Polygons 61 297, Vertices 62 063.
The following were used as references:Bath curtain Kela Largo 180x200 whiteBath curtain Kela Laguna 180x200 Gray
If transparency interferes, you can reduce the value of translucency fraction, and set the color to opacity lighter.
Bathtub from preview: https://www.cgtrader.com/3d-models/interior/bathroom/acrylic-bathtub-pool-spa-windsor-180x85-cm
Who works in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you