Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
Optimize images by mentioning the ALT Text and a short description of the image in your blog post to rank better in Google.
Photos are the most essential part of your blog or post. Take clear pictures on a light background to keep the focus on the product.