Hi Again!
Neat idea, Augusto! That would be quite interesting. Susan, you already have a unique style of maskmaking. After all, it is your imagination behind the mask, right? Though I don't know what medium you used (language barrier), I imagine you can impart that same knowledge to your students. If there is little time, then present the masks already dried for them to decorate. Or, you could combine Augusto's plaster technique with your finishing touches. Here's another way to approach this................
Begin with a demonstration which shows your technique in making the form. That would answer their questions of Ooooh, ahhhh, how did you do that? They don't always understand but they ask a lot of questions which you may not have time for. So, you can then distribute several pre-made mask forms to each student. Next, let them use their form and begin the painting and decorating process while you guide them through it. After all, it is the finishing touches which enhance the features of your masks.
They can even work in groups on one mask from start to finish. You can get each group started on one particular mask. They all pitch in and make it together. This cuts the time and supplies in half. Actually, for time's sake, they can paint and decorate it together. Then, they can leave it with the librarian to display their work with everyone's name on a card which corresponds to each mask.
I have found that children with short attention spans need easy projects. The age group from 8 to 12 years old will probably want to do something really cool. They sometimes have their own ideas such as...I want to make a dragon mask. Or, I want to make one just like that. Then, they get tired when they realize how much work is involved. So, you have to tell them what they will be making and assure them that you will help them through it.
Most of all, it is your contribution to the arts, education and humanities that will be remembered. Make it easy and rewarding. Let the passion for your work come through. When you teach something that comes naturally, it all seems to work itself out in the end.
Regards,
Rozani