Damn! Now this is wonderful stuff, kudos

I appreciate that you put effort into your work ^^
Keep it up Litz!
CnC:
I'm not gonna go too deep into it, mainly because I'm lazy as hell ._.
For the first one, the only thing I dislike is the positioning of the text, it goes against the rule of thirds, but that's completely fine because in art, imagination flows.
Also, you can add a topaz filter to make it look really HQ, unless you were aiming for a grainy appearance (this is mainly pointing to the render itself)
For the second one, the only things I don't like are the lighting levels, they're too high in my opinion, and the fractals around the car itself, they're not "blending" to me, but meh, that's just nit picking >_<