How many colors can we use in the design?

That is up to you. I am open to many colors or as few as 1 or two. I have seen some cool designs of abstract geometric mountains all with different colors that I really like but I'm not allowed to post a picture. It just needs to be urban/earthy colors and not too bright.

Hey,
Submitted a few designs.
Please review them and provide feedback.
Changes, if any,will be made ASAP.
Regards,
Jayneel :)