Love the pack, I have been using John Smith for a while so this was a nice addition. One thing I recently noticed, for some reason the spider use to be black but now they are white. Not sure if this is an issue on my side. I recently did a fresh install of the game and had some issues with MCPatcher and Forge, so it might be something I will have to resolve on my side.
The shading on the slabs seems off, but that might just be my eyes playing trickeries on me.
are you judging form ingame rendering or the picture?
The ghast looks like it shoots fireballs out of it's anus.
of course it is the nether is a twisted place where monsters have eyes on their butts =). (ghasts are asses btw shooting fireballs and stuff at innocent people !)
But on a serious matter i really like the way it turned out. It looks all twisted and wicked, basicly like something from a place like the nether.
the sword would be nice like the wooden sword could be a spear type like with sphax's spade the way it is how its pointing straight so the wooden sword is like a spear then make it more evolved from the wooden to diamond but only the wooden sword as a spear not any higher of upgrade like stone to diamond :3