Facing the same Problem atm.
As Zeus mentioned, there are some Id’s that don’t match each other
For example, if i get the typeId for a Lava Planet (universe/types/{type_id}), the ESI Api gets me
...
"graphic_id": 3836,
"group_id": 7,
"icon_id": 10133,
"mass": 1e+35,
"name": "Planet (Lava)"
...
If i then go to graphic_id 3836 (wich weirdly only supports icon)
https://images.evetech.net/types/3836/icon
no Lava Planet
If i go to icon_id 10133 (ah yes, this one also suports render, but Api says, its just an Icon, very suspicious)
https://images.evetech.net/types/10133/icon
well, still no Lava Planet
To go further, my first try as well was: “yeah, got the graphic_id now, lets send that to universe/graphics/{graphic_id}”
nice try, didn’t get an actual Image, but a path to a “res:” thingy
{
"graphic_file": "res:/dx9/model/worldobject/planet/LavaPlanet.red",
"graphic_id": 3836
}
(if someone could show me a link to a doc how to use them, i would be very happy)
But sadly im still im back to the Question Zeus had already (graphicIds from Api and images Serer not matching),
Using htt ps://images.evetech.net seemt not to work in this case (im limited to 2 links per post, so had to break this …)
I don’t see any error im my progression, maybe someone knows whats faulty here.
edit:
So ok, i wondered what would happen, if i use the type_id as it is.
htt ps://images.evetech.net/types/2015
actually does work, but it only supports icon, icon so small 
Ingame these Images also do support bigger resolutions than the ImageServer wants to deliver.