I'm not sure why it would be necessary to distinguish if it's a descriptive review or not. It should be just as well written, or maybe more so, as a regular, non-DR review.
The main difference in these reviews is that they should cover all aspects of the item being reviewed and note how it might work for anyone, not just the reviewer, in the main part of the review which makes it more objective. Description reviewers are introducing customers to the item, as well as giving their opinion on the product.
So, for example, in a descriptive review you shouldn't see in the main part of the size section, "This is too small...", but something like "This is a smaller..."
The experience section is where you should find the detail on how it worked specifically for the reviewer. This is the section where "it's too small for me..." is appropriate.