Sentence:  `` Speed in painting a picture is valid only when it imparts spontaneity and crispness , but unless the artist has lots of experience so that he can control rapid execution , he would do well to take these first sketches and soberly reorder their design to achieve a unified <WSD>composition</WSD> . 
Meaning of the word marked with <WSD> tags:  the spatial property resulting from the arrangement of parts in relation to each other and to the whole