Hi there,
I have checked out all of the samples you've attached, and believe I understand what you are looking for. It sounds like a fun project to be involved in, challenging, but fun.
With your edit saying that the artwork needs to look realistic, I am not 100% sure what you mean. Are you saying that you want something that is not cartoony, or are you wanting some photo realistic photo manipulation? I am an illustrator, so if it's the latter then I unfortunately cannot help. However if you do just mean a realistic depiction of what you've described then yes, I can do that.
If you'd like to take a look at my Freelancer portfolio then you'll get an idea of my style. Taking a look at the samples you posted, I can certainly aim more towards that style of colouring, but the illustrations in my portfolio should inform you what me line style is like.
If you'd like to chat further I would be happy to talk. Good luck with the event!
Regards,
Joshua