Again, I wouldn't use a Lambert shader to make anything reflective. It isn't what it's for.
If you mean you'd like to use them in general, I'm sorry but it just looks like you're saying here you want to use Lambert shaders to make reflectivity. That shader won't do that for you.
A Lambert shader makes translucency, not reflectivity.
I think your scene here looks nice, the trees maybe look a bit small in comparison to the rocks, though. The reflective wet stones look quite good here.