To me, I read some of the stuff the more advanced/experienced RPers write and I quickly come to the realization that I am nowhere as descriptive as they are.

My vocabulary is not nearly as wide as some of the other people I have met.  One of my biggest problems is describe something; even if I try really hard, I can't think of any good sensory words that can relate to what I am trying to describe.  Others have a fantastic vocabulary and their descriptions can relay the sights, smells, sounds, and overall atmosphere of the subject matter.

Until I can start writing like those guys, I won't consider myself 'advanced'.