Why does the design for most 3D art starts if as 2d art

This is a picture i'm drawing for my art class! i need to know if it good (first of all) and that it represents dia de los muertos (

What do you think it would feel like to have your body covered with palm fronds and the headdress on your head? how would you want to move?

Which is more effective in transmitting information about a bird brancusis bird in space or john audubons wild turkey