Young girl playing the violin in a long-sleeve white shirt.
The girl plays the cello.
Young girl implies preteens, while the girl could mean much older. Playing is the act of doing so at the moment, play just implies that they how to preform the act. A violin is very different than a cello as it is usually help under a persons chin and not placed on a pedestal on the floor.
exists e1 s1 s2 s3 x1 x2 x3 x4.(n_violin(x3) & a_topic(x1) & in(e1,x4) & n_shirt(x4) & a_white(s3) & Theme(s3,x4) & a_long-sleeve(s2) & Theme(s2,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_cello(x2) & n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))