Would you be providing a copywriting? Just like those reference website you mentioned.
Would you be purchasing image stock once we selected from stock images sites (i.e shutterstock, istockphoto, etc)?

For 870px X 500 do you need 4 banners? and which one they will be? Thanks

Dark red is one of official color of your site.am I right?

We will provide the copywriting. Happy to purchase the stock images for the banners as well if required.     

As per the brief, we require 4 banners for the 870px x 500px to replicate the message about our range of services we offer

Dark red is one of the offical colours as per the test URL correct.