design a backdrop 3d cartoon ( Banner )

I want to design a backdrop width=3 meter height=2 meter The backdrop will be cartoon but not in a funny way (this is very important). The backdrop will be used for kid photography. The design should be a 3D which will looks real in a photo. This design should like the American photo. The soldier in the front should be remove as this this will be the position for the kids. The backdrop will not have a floor so should keep this in mind when you design as the photo will be shoot above the level of feet. The photo will show the Saudi Arabia army so the flag will be the one for Saudi Arabia and the faces of the soldiers should looks like Saudi people (I will provide a photo as guidance) we may not need all these number of soldiers . may it is OK to draw only four soldiers and keep the middle empty for the subjects. all soldiers will do the salute. The resolution and pixel should be high and clear to print in big backdrop. I believe that will be above 80 dpi and above 12K pixel. The color should not be very dark as you remember this for kid purpose. The back drop will have a margin about 20 cm from above and below and about 50 cm from the right and lift. These margin will be used for sitting purpose for the stand. However, the margin should not be void and the background should continue but no important subject will be there. Considering the above requirements, I need to see your creativity in the design. When we start the project, I will need a fast draft design so we can modify any important side in early stage. I will need five design for future projects every two months. This is my first photo for these projects. Hope for the one who do this project will be hire for future projects. Be reasonable in your price. Best regards for all.