Hard to say, really. One tip that I got from reading suggestions from another hubber is to do this...prior to publishing, read your hub aloud.
I find that if I am repeating too many of the same adjectives I then try and find a synonym to mix it up a bit.
I think that as we write and read other persons hubs, we end up fine tuning our own writing over time.
Just keep writing and thanks for the compliment.
Ruach Eish gave you very good tips as to becoming a better observer.