Hello adam! Hope you are doing well and dandy!
For the tattoos on his feet, because there two, one each foot, it seems to me that its a medecine wheel. The one on the right foot is the oldest and its clearly a medecine wheel. The other one is an other medecine wheel surrounded by some peoples who are handing hands.
The medecine wheel is a very powerful symbol for many native people around the world, and of course for any people who believe in IT. But I think its more a North american symbol. Its a circle seperate in four. It has four colour: yellow, red, black and white. Each colour represent the four direction, the four seasons, the four ''stage'' of life (childhood/teenage/adult/older), the four wide ''family'' of human (asian, african, native and european). The circle is also very meanful. It repsent life as a continuum, it represent also Mother Earth and many other symbol.
I don't have all the information and i'm not an expert about the Medecine Wheel so i'll stop here to respect that very powerful symbol. But if you are more interested I invited you to ask maybe an Elder to explain it more carefully!

Otherwise theres planty of books thats explain it and you can find many information on the net. The meaning can change a little bit from a tribe to an other but in general its pretty the same...
Hope it'll answer your question, feel free to share your thoughts!
Best wishes of Happiness