Doesn't look bad at all to me, but curled up in someone's hands is the worst way to tell body condition, so it's impossible to be sure.
For a good reference photo, you want a picture of the whole body with him laying flat/stretched out or on the move slithering somewhere.
I've seen ones held like that with that much spine showing or more when they definitely aren't thin at all, so just because it is visible there doesn't mean he is thin.
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