This reminds me of mosaic work. Very artsy! It is very "organic" looking because you chose not to use a standardized grid.
This is Chuck Close, he has his own following because of his unique pointillism movement the style is a bit similar. He creates his own "pixels" by letting the colors mix in the viewer eyes. The cool thing is how he doesn't have a uniform shape or mathematical model for each pixel. I'd like to try something similar myself using just rgb and a standardized pixel shape.
