What i noticed from analyzing images

I noticed that many of the images used a triangle starting from the bottom right and left and ending at the top middle portion. I think that this particular style helps the viewer to properly visualize what the artist would want the person to focus on. Another aspect i noticed is the single point perspective that is usually used which i think also helps to create a sense of realism in the image and to allow the user to really get into the image and understand it better. Colours in the image are usually layered into horizontal rows instead of any other styles which i honestly can say that I'm not too sure why.