So now we get rid of the actual shape of the block which is nothing to get sad about seeing the block was real boring looking. We just draw all the red vectors together starting from the same central point. It makes the whole thing look simpler.
We've also drawn all the blue arrows together. This part is quite boring. I've just included to let you know you often have to draw more than one free body diagram to solve problems involving multiple objects. All this diagram says is that the tension is transmitted all the way along the string.
