@sonimrajk The face textures can most likely be changed BUT I'm not sure how changing the actual mesh models of the heads works at all. So for example if you tried to change Steve Smith into Virat Kohli then you would most likely end up with Kohli's face pasted over Smith's head shape with his hairstyle as well. Also like Waste says there is probably no way we can get photos as detailed as the scans that Big Ant use so they would end up looking subpar.
In terms of the grass I've managed to get it the right colour but the lawn striping makes it look very weird so trying to sort that at the moment.