Dark-haired art student working on a project while standing up.
The student is painting.
Just because he is an art student it does not imply that he is painting. He can work on other projects also.
exists e1 e2 s1 s2 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & a_up(s2) & Manner(e2,s2) & Actor(e2,x3) & v_stand(e2) & on(e1,x4) & n_project(x4) & Actor(e1,x3) & v_work(e1) & (x1 = x3) & n_student(x1) & of(x1,x2) & n_art(x2) & a_dark-haired(s1) & Theme(s1,x1))
exists p1 x1.(n_student(x1) & exists x2.((x1 = x2) & n_painting(x2)))