I've had him for 3 months now and is only 6 inches. How does he look
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The question is a bit cryptic to me.
He looks overall more or less average. A bit, or noticeably, thin - the body is thin w.r.t. the head and some bones are visible, especially on the cranial shield - the spots that should be filled with more muscle mass. This may explain why he is still on the small side... unless you started with a ~0.5"-er 6 months ago.
The dorsal fin and maybe others are a bit tattered - something bullies him a little, not too viciously, which again goes along with the thinness and the possible slower-than-average growth.
I'd not say this is terrible or wrong but since (I think) you are asking for something more than comments on the exterior coloration etc...