How to realistically overlay a photo?

Question

Adobe Photoshop

Good day, I need to create a realistic bathtub effect in the bathroom for an online bathtub store. It's like a real photo.
Here's what I did:

It doesn't look real at all.
Desired effect:

Hope for your help!

Answer 1

If you are the first day in Photoshop, then they lied that you will get something similar to the real thing. You need to play with the CC by the bathtub, make a realistic shadow (better done with a brush) and degrade the quality of the bathtub so that it matches the quality of the background, but it's better to replace the background with a better one

Answer 2

Color correction, add a shadow, make the incident light correctly (Now the light from the window and the light in the reflection of the bathroom go in different directions ..).
And frankly speaking - Do not fuck your brain and give it to a knowledgeable designer. There is enough such self-made clap in RuNet.
Do it yourself?) Don't be fooled yourself