How to scale up a picture
Sometimes you can return home with an accurate line drawing that you think would make a great painting. But how do you scale the sketch up and transfer it to your watercolour paper? Follow the steps below and I'll show you how.
Lay your sketch (here shown as the piece of blue paper) onto one corner of your larger shet of watercolour paper. Then draw a faint line through the diagonal of the sketch and onto your paper (1).
Then draw a horizontal line (2) and a vertical line (3) to create a rectangle of exactly the same proportion as your sketch.
Now you are ready to transfer your line drawing (I've not drawn one here as it would complicate the lines, so you will have to imagine one on this piece of sketch paper!).
To make it easier to scale up the drawing, just draw as many horizontal and vertical lines as will be helpful to you onto the sketch...
... and then do the same on your watercolour paper. You are then ready to transfer the sketch to this paper by copying what is in each smaller box.