Six identical charges in hexagonal setup problem

[MoAli]

Homework Statement

Attached the original script. Sorry but I don't know how to type in latex so its easier to attach photos.

Homework Equations

E_T=Σ⁶_n=1E_n

The Attempt at a Solution

I attached what I was able to do, I know there is a mistake is in part (b) that I can't locate and any help or guidance would be appreciated .

 

[mfb]

The orientation of the image looks wrong.

How do you take into account that there are 6 charges in (b)?