That will not get any kind of depth that way.
You are going to need to use a more narrow light source from one of them.
Lighting is like sculpting. You have several types of light you can use.
From there you can manipulate intensity, color, contrast, etc.....
Think point light (bare bulb), area light, linear lights, spot light, distant
light. All of these lights are slaves to the inverse square law so that is
a given... but they also have other properties you can manipulate.
The key is to master them.
You should practice with just one light source first.
(By the way, you can use the sun as a single light source too.)
Then two. Make it a main light, and a hair light.
Next graduate to three. Everything else is gravy.
Also learn to master the meter, it'll basically tell you everything
you need to know about how things will look on film or the ccd before
you click the shutter.
You can shoot yourself an exposure template so that every time you shoot,
( And I mean every time) you can guarentee yourself the consistent results
needed to do photography.