One of the first things that came into my mind when I first played Krastorio and saw the tank (which is very cool) was that in my opinion it looked a bit out of place because of its very dark color sheme. There is no other vehicle that has such a dark color.
So I tried to change it on my end to look more in place to the other vehicles and this is my result:

Vanilla Krastorio:
https://steamcommunity.com/sharedfiles/filedetails/?id=2198698455

Adjusted colors:
https://steamcommunity.com/sharedfiles/filedetails/?id=2198698403

In my opinion it fits better to the rest, so maybe you want to change it in the vanilla game as well?

We don't want continue our work on this mod, we will only fix bugs and other... anyway u can release a mod that modify the sprites at startup

That is very sad but I understand and thank you both for your awesome work. I hope that this mod will not die any time soon now when it will become incompatible to the future progress of Factorio.

But anyway, if anyone wants to create a mod with my changed graphics, please feel free to use my files (all is available and done, you just need to put them into a working mod):

https://www.dropbox.com/s/8dowebjoaodif9z/Krastorio%20Tank%20Graphic.7z?dl=0

U can do it urself easly, in this case is enough that u look inside the Krastorio 2 files and find how is defined the tank, and do in a mod in the data stage of mod data.raw.car[tank-name].property1 property2 and so on and u override the sprites, on the wiki of Factorio u can find moew informations.

Thank you but its not that easy for me. I dont understand how to replace the whole graphics.
I think the tank graohics are inside the layers, but there are several layers (like an array). One for normal, one for shadow and one for mask. How do I know what I have to replace with what graphic? They are not named. How can I replace the first with the base, the second with the mask and the third with the shadow? I guess thats what I have to do.

I am stuck with a line like this:
data.raw.car["kr-advanced-tank"].animation.layers ... ???? I dont know what I have to do if I want to replace the base png with my png now.

Maybe someone can help here? Thank you!

Ok I made a mod now. Grab it here if you like:

https://mods.factorio.com/mod/KrastorioTankGraphics