Thanks Playalot.
I need to ask their mommy sim draw focused picture. She is able to draw all kind of emotional painting.
Because the teen sims keep moving their place to another, so I can't make them together in one place.
For example, I gather them into the living room and place the focused light or objects, then I click 'do homework', then one of them just take his homework book out and go out to other room has the bar causes inspire mood. I placed a couple of easels there cuz they can get inspired from bar. And he starts homework in inspired mood. I need to take him out again and let him back into the sitting room to get the homework done. It's kind of annoying. haha.. After completing homework, I ask them to do the additional one, suddenly, they stand holding their homework, then go out to the back yard, then they start the additional homework sitting at the outdoor dining table.. So I think I better use the focused picture, then I can place it wherever they go. hahaha..
For this afternoon, one of them watched the romantic comedy on TV to release his stress, then he finished his homework in flirty mood......It was strong. I gave him the focused light for him, but the flirty happiness was too strong,so I couldn't chnage it..