Do you have any advice for people who write too concisely (i.e., me)?
Okay, kidding. Honestly, I don't know how much help I can be here because personally I try to write concisely. I'm not a fan of purple prose, and I'm not sure how to write elaborate description well without falling into the purple trap (although I know it can be done).
So I aim for concise. I'm not sure you can write too concisely.
Rather than worrying about concise or verbose (which is really just word count, which really only matters if you're getting paid per word), take a look at whether the prose does it's job: to pull the reader into the story. There's like a bazillion ways to do that, but I think it can be done both concisely and verbosely. I've seen great authors do both.
Got a question? Ask me anything.