first : open a new file at photoshop, size : A4 size
for the background I use one of my collection background from deviantart.com, open it and just simply drag and then make it bigger with edit > free transform. same thing with the paper background.
I also add some png, just open it and drag because it already cut off just the picture without background.
for the fashion pictures, I cut it using quick selection tool, change it to + and then click at the picture while drag it, make sure you drag until covering all the picture and leave the white site. if you want to cut the inside part using - , click it and drag it. After that, to move it to your calendar design, chose edit > copy and open your calendar, edit > paste, do the same thing with other pictures. arrange the pictures with edit > freetransform
make the box, using rectangle tool. click and drag, don't forget to press the shift tool to make it square. Right click at the layer, choose duplicate layer. change the colour with paint bucket tool, click the square. doing this step again until enough.
for the text just use the type tool and arrange it with free transform
RESULT :
