Charity billboard advert

I'm looking for someone to create a hi-res image that we can use on a roadside billboard and in marketing for our charity.

The size of the billboard is 5796mm (w) x 2748 (h) and the image would need to run along horizontally along the centre of the billboard with space for text above and below.

I have attached an AI image which we really like. If possible, we would like to have 3 cows as we think it would work better on the billboard. They need to look friendly and have the white stripe around the middle as they need to be Belted Galloway cattle.

I have also attached a sample billboard design just to give you an idea of how we would like to use the image. We would move the logo down so the cows would fill the middle section.

We will do the wording - we just need the image.