Observe what other people are doing for the same question. Read about various famous and interesting buildings/ monuments (architecture); designer clothing and accessory, unique products and fascinating animals and plants. This should get you started on effective idea generation!

practice

try to solve maximum number of previous year questions........read the question carefully word by word.....and frame a picture in ur mind.....

at the initial stage u may find it difficut.......but if u r frequently used to it.....u will find it easy.....u will be able to draw anything......

ALL THE BEST......