This is good work my friend ^^
You remind me about myself a little while ago. The stage you're at now is the stage where your skills in photoshop will increase immensely over the time that goes.
I got a suggestion for you about the C4D image at the top.
When you use the "Matrix" option, you should try use a material that is more reflective, so you can show the shapes better. Also you should make a better lightroom for it, it will make it look alot better and not that crisp.
Also you should try to make the colors blend better.
(This is purely my opinion, there is no right or wrong in Editing)
If you want to check out some of my work, you can go to either my youtube, behance or deviantart.
Youtube: youtube(dot)com/user/ephixihd
Behance: behance(dot)net/ephixihd
Deviantart: ephixihd(dot)deviantart(dot)com
ps. i havent uploaded stuff in a long time because i do not have my computer anymore, im using my old laptop until i get my new comp
-EphixiHD aka Sebastian Sande