Draft Step by Step

First I opened photoshop and made the document the correct size for the whole book cover, which was

 72.25 cm in width and 32.26 cm in height. I then put a black background on the two parts shown below.

Once I had put the black background on I put these images on, which I found on the internet.Then changed the opacity to 60%.

Then I started to play around with the Hue and Saturation by going to Layer>New Adjustment Layer>Hue and Saturation. I left the hue the same as it got rid of the blue in the water, which I wanted to keep. The values I used were Hue:0, Saturation:-71 and Lightness:0

Once I had finished with the hue and saturation I changed the levels on the two images and I did this by going to Layer>New Adjustment Layer>Levels. I changed the values to 0, 0.5 and 255.

I then moved on to brightness and contrast and I did this by going to Layer> New Adjustment Layer>Brightness and Contrast. I didn't change the brightness but changed the contrast value to 34.

I then moved onto putting the black border on the edges of the water images. I did this by filling, over the images, a new layer with black, I then went on to setting the new layer to multiply. Next I got the brush tool and with a soft brush set to white and coloured the area I wanted to be the Image. Next I went onto the flaps of the book cover and also the spine. Firstly I started out by getting the colour I wanted (shown below) and used the rectangle tool to create the spine and flaps.

 Once I had done that I started to add text such as the title, sub-title and author name. The font I used was Augustus, I used this because it was very similar to the original text used on other covers for Percy Jackson.

 Afterwards I added the blurb and reviews in the same typeface I had used for the title, sub-title and author name. Additionally I added the title to the spine and also the author name, again in the same text. On top of that I added a trident image to the spine in white because it symbolizes Poseidon, which is Percy Jackson's farther.

In addition I used the brush tool with 0% hardness in black and coloured the top and bottom of the title, sub-title and author name ,on which the front cover will be, to make it look like the text is underneath the water.

Finally I added in the rest for instance the star rating, image of Rick Riordan, author, about the author, barcode, price, publishing company and logo and an extract from the book. I took the images for the author, star rating and publishing company's logo. For the logo and star rating I had to fill them white to fit the theme of the book cover. The text about the author, reviews and extract are also from the internet, which I then turned white again, the typeface I used was Calibri because it was easy to read.