Any claim made about " the style" being "similar to the Obama Hope poster" is a false equivalent. Style is a result of both process and preference of the artist and is about the medium used (charcoal, photography, paint) and its application. It is a "formal" quality (meaning size, shape, color, balance, etc.), of a work but does not in itself create a meaning nor a context. Again, the art stands as pure design free from imposed biases. A style can be applied to anything and by anyone.