Open me
Other random ones
this is truly suspicious
http://imgur.com/gallery/Lnr3l
what software did you use?
C4D I reckon.
I like it.
To be honest, I expected something horrible when I clicked this thread but I'm happily surprised.
For your abstract spikey stuff, try more dramatic lighting.
It will truly spice up your work.
The black on the first one seems a bit out of place, softer lighting would work better.
Second one is pretty decent although some might say a bit boring.
You could try different camera angles for a more interesting composition.
The third is your average "I've got C4D so let's fuck with textures and spheres" kinda thing.
Nothing special nor interesting.
The fourth is where you went a different path and tried realism.
I'm a big fan of abstract and I think you should venture down that path some more.
It's obvious that either your computer or your skills can't pull realism off just yet.