I think you did a pretty good job with this one. Where did you find the coffin?
The only things I would point out is that it looks a bit odd to have no lighting fixtures on the back wall, and the black runner would usually be a deep red one.
Other than that...bravo.
coffin is
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I changed the textures on everything but the wood on the sides because its not separated by surfaces, so if I change it to a solid color the metallic fixture on the side would be missing but the hand holders can be changed. I like your idea about the light in the back gonna steal that, should make for a more dramatic look. I did not think to add them because the church did not come with them originally. it had ceiling lights but they did not have any emission properties. and about the carpet is was red with gold lines on the outside originally but I though it gave too much of a wedding vibe. I'm gonna do some research and see if its appropriate, I have only been to one funeral my self (luckily) and it did not feature a coffin they were cremated.