Ah.....you seem to have fallen into the 3D trap!
What you've done is fine, nothing wrong with it....as a 'Scene' its great....but...
...you've misunderstood what 3D is all about, and that's perfectly acceptable.....anyone starting out in 3D work does it so at least you're on the right track.
What you've done here is to 'think' that YOU need to apply the 'reflections' to the objects in the 'Scene'.
This is the trap......you don't need to at all!
The whole idea behind 3D, (although on a limited basis with PS), is this...
1. Set the 'Scene'...meaning add your objects, position them and animate them if needed. You may also add an 'Environment' or use an IBL system to fake one....which is the default for PS....and probably used in 99% of all 3D.
2. Create your object 'Materials'...meaning, create a material that has the same properties as the object would have in the real world....so reflective things need to have a 'reflection' property. This is where PS falls down a bit compared to mainstream 3D software....the options for material creation is very limited by comparison but still pretty good.....for example you cannot set the IOR value for say a transparent material.....which in other 3D software can be set to 'float' glass....lead crystal glass, diamond, acrylic...etc etc.
3. Lighting. Get the right lights in the right position. If its an 'outside' scene then obviously just one big light to represent the sun is all you would need. Indoor scenes would mean replicating 'Blondes', 'Redheads', softboxes, candles, incandescent 60W bulbs....even led's! Get the lighting as close to a real world scenario as possible....appropriate to your scene of course.
4. Camera Position. Just as in photography the framing of the image is just as important. the advantage with 3D of course is that you can not only move the camera if the shot doesn't look right but you can reorganise the objects in the scene to get things just as you need them.....something you may not be able to do in the real world...especially with 'action' photography.
The end result of all this is that for your example you need to create the right 'material' for the spheres....reflective in other words. THEY will then reflect their environment depending on the other objects around them.....the items on the groundplane in your case.
When 'rendered' thats when the magic happens.....the 'rendering' process takes a while as its calculating exactly how objects should appear according to those items mentioned above.....done by emitting 'rays' from the camera to many many points on each object and calculating what you should see at that point....it traces along every point on every object which is why the process is called 'Ray Tracing'. There are other processes but this method is deemed the starting point.
So in a nutshell, change the materials of those spheres to something reflective, render, light your pipe, sit back and admire your handy-work.
Sorry that's a bit long, (and it's only a fraction of the tip of the iceberg too!), but 3D is just a tad more involved than laying down pixels on a canvas.
Let me know if a 'scene' would help you...I'll try and throw something together to explain my ramblings.
Regards.
MrToM.
Not a brilliant example but...