The first thing that jumped out at me was the title of the piece. It's too vague. Every poem, in some sense, is a still life portrait. There seems to be 'something' going on beyond description. Maybe not. The 'young girl' seems superfluous because you could equally substitute a first person or "people" or passengers and it wouldn't make a hoot of difference. You bring it back to the girl, which works, but why she gets more attention than the leaves I couldn't say. My interpretation is the girl is part of the landscape, part of the still life. I dunno.
The bus 'purrs'?? More like a guttural cough (I used to live next to a bus stop)

But it's England and I've never been there so I'll take your word for it.
I like what you have up until here, the transition is awkward, aesthetically.
Quote:
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Originally Posted by quote
to the other side of the road;
swallowed
by a hungry bush
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a hungry bush?
a bush
fat on summer
works fine.
I liked the visual of the cat like a spring and the line about smallness equating to safety. I was a bit confused though as far as figuring out what that means as it pertains to the cat and its smallness (?) Seems random.
Anyway, thank you for this bus ride on the #7. Quite a view from that top deck.