In a word, descriptive. I write a lot about what places and people look like and can be fairly elaborate when describing how character's feel. As a result of this, I use a lot of similes and metaphors and tend to go into a lot of detail setting the scene and describing thought processes while the actual events of the plot tend to be written a fair bit snappier by comparison.
As for any authors I'd say I'm similar to? The closest I can think of is Stephen King, which would make sense since as one of my favourite authors his writing has probably had a fair bit of inadvertent influence on mine. He is a very descriptive writer who illustrates the world and his characters down to the minute detail. Mind you, I wouldn't say that our writing is particularly similar beyond being very descriptive in nature, I don't set out to imitate the writing styles of others and I'm certainly not nearly as good.
Interestingly enough though, the one thing I did intentionally imitate was taken from the author of a webserial I really like. That being the format that Stairway to Heaven is written in where after a set number of chapters you get a change of perspective to characters other than the protagonist, often following events that, for the moment, seem divorced from his adventure.