Could you please check these last sentences, please?
1) He is wearing a grey sleeveless T-shirt and a pair of tracksuit pants.
1) Most penguins at the Blackbrook Zoological Park are swimming actively in the water except for a sad-faced one, who (which?) is standing on a rock.
2) He’s staring into the pool. Eleven-year-old Kentucky is afraid of cold water and so spends his time walking slowly on the rocks.
3) Keepers have to put him carefully into the water or put water quickly over his head every day, to keep his feathers clean.
1. which
3. remove comma
All else is fine.