R1ck

A sign that says "Hello yes this is hell"

There is no such thing as too much black and red in hell ;-)

You're using cc4-tex I can see. There are multiple colour versions of those hell textures. mix some in. add some platforms using the black or red textures, use a different sky! Any hell map outdoor area will look weird with a bright sky like that.

Also, lava and blood, as well as flesh and other texture types really make a hell map look better.