Step 9

Add layer mask into current shape's layer. Draw white to black linear gradient using gradient tool, drag diagonally from bottom left to the top right corner of the white rectangle. If done right, you should get some nice "glossy" effect as shown in image below.

Step 10

Draw a blue filled (#005c98) ellipse shape with the Ellipse tool. Use the transform command Ctrl+T to adjust the blue ellipse's size and position as shown in the image below.

Step 11

With the blue ellipse selected, press Ctrl+C to copy it to clipboard. Press Ctrl+V to paste the blue ellipse we copied earlier. Duplicate blue ellipse shape, upscale until it gets a bit larger then the previous ellipse. Alter the path option to Subtract Front Shape. This way, the first ellipse shape will be cut by the second one, leaving a 'curvy shape' as a result.

Step 12

Still on the shape layers, go to the path option and then click the Merge Shape Components button. Those 'curvy shape' should be merged by now.

Step 13

Duplicate the 'curvy shape' layer, flip it vertically using the Edit > Transform path > Flip Vertical. Use the Move tool to drag it all-the-way to the left and then change the blend mode to multiply.

Step 14

Add layer mask to 'curvy shape' layer, use the linear Gradient tool to hide half-right side of the shape.

Step 15

Repeat step 13 - 14 to get another curvy shape layer for the canvas bottom. Use Free Transform command to upscale its size.

Step 16

Select all layers, except the background, water sport and sun island layer. Hit Ctrl+G to group selected layers. Double click the newly created layer group, so now you can rename it to "blue shape". This step is optional, but i usually group my layers to maintain orders and simplify things.

Step 17

On the top of 'blue shape' folder, draw a pale brown (#efe0c9) rectangle using the Rectangle shape tool.

Step 18

Use the Edit > Transform Path > Warp menu again to curve the rectangle's topside. See image below for your reference. Hit Enter to apply warp command.

Step 19

Add another dark brown (#b19e90) rectangle to the bottom, around 425 pixels height. Use the warp command again to curve the topside of the rectangle.