Ok, let's say I agree, you convinced me.
As the first picture is good quality. It might be armor, or not.
If this is armor, then weak zone at frontal 60 degrees will be reduced to turret bustle only. This is improvement for Mk1, but still not 100% safe, because as far as we know, it does not have isolated turret ammunition rack. Although if such isolated ammunition rack will be present in Mk2, then situation definetly will significantly improve to the level represent by the best NATO MBT's.
The only thing that needs clarification here is
1. how far the ammo rack is there from the side turret storage box?
2.is there any thing protective placed between ammo rack and side turret storage or tool box's iner wall?
As for now, the situation might look like this. It is possible that different tanks have different configuration, so some might have only storage boxes, some might have this different type of box, that might be armor. Clarification needed.
Note! Drawing is imperfect, I was making it in a hurry, so it is only approx to the assumed reality.
As far as we can conclude from Arjun Mk1 design, the left side of turret (right side of drawing), have unprotected ammunition storage, so this is still danger zone for crew, reduced yes, but still dangerous untill ammunition storage won't be isolated (if it is not isolated on these, let's call them "improved" Arjun Mk1), however the right side (left side of the drawing), is more dangerous to the tank itself than crew. If Arjun Mk1 is more or less based on Leopard 2 design scheme, then in that part of turret bustle, there are radios, elements of FCS and turret servomechanisms, if this place will be hit, there is potential danger that vehicle will lost it's FCS, servomechanism or radios.
Can we agree with such opinion?
