Second one is surprisingly nice.
You need to change your lamp to a sun, up the shadow sampling and use constant QMC.
On your ambient occlusion up the number of samples to get a nice smooth look (without all the noise), and try swapping it to Both to really push the shadow, right now it is very washed out.
It looks like you havn't done much material work in terms of phong and shaders, so perhaps look in to that to make your second render more believable. Raise the hardness and add some reflection too.
Look up HDRI for blender, and that will help you with reflections too - and add more things in to your scene if you are testing reflection/refraction