What was Frida Kahlo greatest challenge?

In picassos masterpeice bulls head which bicycle part makes up the bulls horn

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

Which rule of composition applies to portraits? a. lead the eye the eyeline rule c. the rule of odds d. use of lines e. rule of thirds