Swamped

The one time you can recall willfully using magic, as opposed to on reflex, was when you read your father's book and healed Captain Long.

So if the sketchbook does have any magic in it, you'll have to unlock it. Maybe the pictures hold some kind of clue.

You head back down into the wagon, not wanting to expose the sketchbook to the elements. Then you take the package out of your pouch, and pull the book out of it. You flip through and look for something, anything that might be a clue.

You hope that if it does hold a spell, the notes you can't understand aren't essential to it. Maybe you can resolve some of the puzzle, at least.

You focus on the familiar faces first. Father only appears in that one picture, but Long and Mudviper appear more than a few times. Both tend to be in shots with soldiers, and not usually together... though, now that you're watching for it, you realize that they both appear first in a sketch towards the beginning of the book. They're standing on either side of an older couple, and all four of them are smiling.

When you first saw this, you were so struck by the familiar faces that you hadn't given much thought to the picture itself. But glancing at it, you can't help but think they look like a family. Are Long and Mudviper brother and sister? Are these two their parents?

You can't answer that for sure. But it's given you two more faces to watch for in the other pictures. You flip through again to see what you can find.