Artist impression drawings for extension

Not sure I will get any success in asking this here, but I'm struggling for ideas.

I have inherited approved plans for a house just purchased, but would like to make some minor tweaks to the design whilst also getting some 3D colour artist impressions drawn up - all I currently have are 2D black and white drawings.

Can anyone here help with such a service, or point me in the direction of someone that can?

Something in a similar style to the below image:



Thanks a lot.