Here's the other open source pic of the Arihant:
There's no massive hump like either the Deltas or worse, the 094 Jin class. It looks a lot more like the Le Triomphant class SSBNs
but without the same clean lines. The external hydrodynamics look superior to the Chinese SSBNs and probably better than the Deltas too, if the propulsion and internal sound/vibration isolation systems are also good.
Another interesting thing. These pics on this thread from 2009 analyze the SBC's location:LinkLink
As you can see, the Chakra was berthed in front of the short covered pen seen here:
The pen can be seen in front of the Chakra in the second pic from Shiv Aroor livefist blogpost: link
The SBC is the long building behind it - long enough to hold 3~4 subs, each about as long as Chakra. Gagan's picture shows that the harbor is quite extensive, but they parked the Chakra all the way up in front of the SBC. I wonder if this will herald more pictures of the Arihant (and even Aridaman) soon enough.