Thick snake. Doesn't look malnourished. It also looks closer to a year old from the picture. (500-700 grams?) But, snakes grow at different rates. If you track his weight, you can see how much weight he gains over like 4 months or so and see if he's just a fast grower. He looks good and that is the most important part. Ball pythons live for 20-30 years, so 6 months off or so doesn't really impact how much time you will have with him.