Not quite centred and rocks would need adjusting but heres another idea
Like the wood placement a lot, the rocks don't balance it. I'd smash some rocks. Make smaller pieces. All the rocks are too similar in size right now. If you make some different sizes, it'll look more natural. Make some rocks rubble, other rocks smaller. Look at Andy's rocks (man this sounds terrible right now). He's got little rocks, big rocks, rubble rocks, etc. No riverbed or streams have feature rocks of similar sizes. I know, it'll be hard to smash your own rocks.
Getting better at playing with both woods and rocks, though. Taking some lessons from Ian, eh?