Sources 2 & 3 are renders, and not useable.
5.6. 3D Renders or Illustrations as Source:
Using other people's 3D renders or illustrations (even with permission and no matter in which form they are offered) creates a false impression of your artwork. So 3D renders or illustrations can not be used as sources, unless they are entirely created by yourself. Only acceptable non-illustration brushes and clip art may be used, but you need to mention them as a source too. Don't use an image that has been altered by the source owner nor an entire work created by someone else.

What CMYK says...

i have now notified the stock owners that i've used their pieces as you can see in the final step of my SBS, i did the same thing for the 4th source too.

i like the feel of this.. very effective. Good luck!

very awesome!

Looks very nice, i think you should add some more saturation/vibrance tho

good idea!

Interesting image, but there should be steps on the ramp leading to the top of the pyramid...

neat

I loke how you used the source and how everything fits together; the foggy atmoshere is like the cherry on a cake

Congrats for your third place!

Congrats!

Congratulations for 3rd

Congrats!