What did Basil see in the picture?

From the text:

There was something in its expression that filled him with disgust and loathing. Good heavens! it was Dorian Gray’s own face that he was looking at! The horror, whatever it was, had not yet entirely marred that marvellous beauty. There was still some gold in the thinning hair and some scarlet on the sensual lips. The sodden eyes had kept something of the loveliness of their blue, the noble curves had not yet passed entirely away from chiselled nostrils and from plastic throat. Yes, it was Dorian himself. But who had done it? He seemed to recognize his own brush-work, and the frame was his own design. The idea was monstrous, yet he felt afraid. He seized the lighted candle, and held it to the picture. In the left-hand corner was his own name, traced in long letters of bright vermilion.