Monsters Vs Aliens on ds

[jojo75]

Hi Guys, please help i have just bought monsters vs aliens on ds for my son, we are on one of the svery first levels and are stuck. the prof bug thingy has set bob a task, you have to draw something in a box within 10 seconds but i either can't draw what i think they are asking or i am drawing the wrong thing altogether.
Please can someone help a mother without a clue.
Thank you
Jo