Could it be the windows are set to not be reflected? I'm not a Blender user so that's the sort of guesses I can make
Front light: That's the reflection you are seeing. You need to tweak whatever you are using to be reflected, to be reflected on areas you want, but not where you don't want them. Welcome to the fabulous world of studio shots
I think you are trying hard (that's meant as a compliment) but need to pay more attention to lighting. I'm sure the quality of your renders will skyrocket ones you do.
Very nice. Smooth and stylish Few comments though: Remember to frame properly (XRG rear is clipped by the edge of the render). The logo looks misplaced and off style. If that's how the logo looks then there isn't anything to do about that, but placing it for example somewhere above the cars would work better IMO.
Haven't made any render for a long time. Rims have no material, that's why they might look odd, but I forgot how to add materials to the items that you add in the render (the items that weren't originally there).
mlucky: Nice ones. The edge of the shadows on the ground gets bright on both renders which makes them look off.
andRo.: cool ones too but don't save with 16 bit's per channel for display purposes. The 8MB filesize would be reduced to 1.73MB as a regular 24bit image and even Superman wouldn't be able to see the difference by just looking at them.
This is what I mean (it's not exact science but close enough). I kept the PNG in 16 bit's per channel, but could just as well have converted it to 8 before uploading it.
I can understand the temptation of using bigger numbers and thinking that would lead to better quality - but its misguided belief. I'm beginning to notice more and more people post renders (including on this forum) in 16 bit's per channel, and I think Vista and Win 7 could be big reasons behind this new trend.
Vista and Windows 7 store wallpapers in Jpeg with a high compression on top of that. Microsoft are the real noobs and should be castrated for this. I'm not talking out of an artistic point of view, but while harddrives only get larger and larger MS decided to compress images for us?? How many pics do they think an average user has or collects over time since filesize seems to be so vital to them?
It annoys me that some of my wallpapers take a big hit from this compression, but I'm not aware of any solution to this.... yet.
It's completely up to you and depends entirely on how serious you want to get about editing. If you just want to do few tweaks here and there then you'll be fine with 8bpc for a long time. If you want to save in best possible quality for editing somewhere in the future then go ahead and save them with 16bpc - but always make 8bpc copies when you want to show others. 16bpc is useful for editing and professional printing.