I'm always surprised at how little is enough to be considered a good comment. Although I know from my own experience that it's usually just something like "good" or "beautiful". It's nice, but it's just standard. The alternative is usually simply no comment. Personally, I think if you're going to comment, then a few (even grammatically complete) sentences should come along.

But still three months until the next output? Are you currently taking a cyberpunk break or is the project huge? :D