I don't think we're at the stage to be handing out numbers here, but I think you could improve your score with the following:

• You're using two colours of cheese - this is great - but why no picture or pattern? A simple quartering of yellow and orange squares would help - or if you're feeling adventurous, a little house, heart, pacman, face of Christ etc.
• The cheese is only partially melted. If you have access to a grill, you might want to leave it under a bit, until it begins to bubble.
• There's not enough of it. You know why toasters have two slots in them? You should always eat toast in sets of two.
• This may be controversial, depending on where you live, but to my mind the brown lumpy stuff ruins the purity of the cheese on toast. With the exception of butter, which is a structural glue, and can be considered part of the toast, "cheese on toast" should be both the title of the meal, and the list of ingredients.