Simple Future Tense: The artists will create a new painting tomorrow. (At one particular time in the future, this will happen).
Future Progressive Tense: The artists will be creating a new painting when he arrives. (The action of creating will begin before he arrives and will be in progress at a particular time in the future.)
Future Perfect Tense: The artists will already have created a new painting when he arrives. (First the artists will finish creating. Later he will arrive.)
Future Perfect Progressive Tense: The artists will have been creating a new painting by the time he arrives. (Event in progress before another event in the future.)
