Capture beauty on the page and it will enliven the work. Engage the readers’ senses with your expressive details, your moods and textures, and you’ve got him where you want him.
But give him too much of a good thing, and he will soon slow his pace and skip down the page in search of action. Make him work to remain interested, and he might even quit, bored or weary.
The problem is that mere beauty—however rich and luscious at the inception—is not enough. And a lot of it only makes the problem worse. Without some edifying or gratifying elements in return for your reader’s consumption of all that glory, descriptive passages only add volume, even bloat. Every passage has to pull its weight and not just sit there and look pretty.