Describing a scene, a person, or an object can make your novel shine or rust. There's a happy medium between describing something just enough to put the reader there and overdoing it to the point where you jolt them out of the novel. It's easy to tell too little and confuse the reader. I've been guilty of this myself. Sometimes when you're rushing too fast to finish the work this can happen. That's okay, as long as you take your edits nice and slow and catch it there. More than one scene in my manuscript will start out being anorexic and I know I'll have to spend extra time on it during one of my many edits.
You can go the opposite direction and overwrite a description as well. As a reader I love good description. But if the author goes on for pages where they're just describing the scenery or the weather and nothing is happening, I'll probably close the book. There is the key, something has to be happening. You can describe a grassy meadow the character is walking through or a murder scene they're arriving at so long as the description has meaning.
A description can be to set the mood for a scene or to teach the reader something about a fantasy world, but regardless of the intent of the description it must add to the flow, not stop it. Think of your book as a river. If you damn it up in places people might choose that spot to get out of the water.
Here's a great link by Writer's Digest on enriching your descriptions: http://writersdigest.com/article/enrich-your-descriptions