You will need to create several different designs for your magazine, considering different layouts for both your text and images before settling on your final design. Each of these designs should be analysed in terms of their pros and cons before you state your final decision. Your initial design created for your survey can count for 1 of these drafts, however the remaining 2 designs for each page should take your audience survey responses into account and show considered and measured changes from the initial design.
You can draw these designs by hand if you wish, then photograph or scan them into your blog post, or you can create a digital version in a program such as Photoshop or InDesign which you would then upload to your blog.
Some good examples of planning and mock ups can be seen below: