Product photography is tough, and you are off to a very good start. I like your use of light and shadow to show the shape and texture of your subjects, but think the shadow is a little too deep.
I've struggled with it a fair amount, and have gotten to the point where I get decent results, although it's been several years. I'm no expert, but can offer some suggestions:
I think you need to add more frontal lighting to all 3, but especially the first and third. The shadows are too deep, and don't show the front of the objects enough. I'd add a large diffuse light source from the front, stopped down somewhere around 1 stop from your key light.
Adding more frontal light to the vase will be trickier. Maybe just a carefully controlled highlight to show the glassy surface.
Also, the flask in #1 is dirty, or scratched. You want your subjects to be totally spotless. Take a very bright handheld light and rake it across the surface of your subject before you shoot, moving it around to skim across all the different parts of the surface, and use the raking light to look for dust and scratches. The dust you can clean off with a lint-free cloth treated with dust remover. (A product photographer might have a better suggestion for cleaning your objects.) You probably need a brand new, pristine object to avoid scratches.
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Regards,
Duncan C
dpreview and PBase supporter.
http://www.pbase.com/duncanc
My macro gallery:
http://www.pbase.com/duncanc/macro_pictures&page=all
and has traveled with me quite a bit. I wish I had a new one. Theres definitely less light on the front of these objects - something i will work on henceforth.