Step 4 – Strokes on the margins
Use the Pen Tool to draw the lines tracing the margins of the components and then right-click, and select Stroke Path with a brush size of 2 or 3 in white. Pick up the Eraser Tool and erase the end of the strokes to create a feather effect.
Step 5 – Paper
Draw the shape in which you want the paper with the Pen Tool (P). Fill it in white with the Brush Tool (B) or the Paint Bucket Tool (G). To make it more realistic, you should add some noise to it (Filter > Noise > Add Noise).
Add shadows with the same tools that we’ve been using. Make a selection, and then brush slowly with black color in the zones where I’ve marked in red.