So it's not exactly your fault that it's a boring map, but it is your fault because you picked a boring map to remake.
But hey, it's also got genuine problems that can be fixed easily for your next map:
Differential shading. Know it, love it. Flat lighting in your rooms make them boring.
Align your textures properly. And I don't mean where you had them purposely misaligned for secret doors; there are areas where you use textures that have discrete border lines and they're cut off oddly by not being positioned properly on the texture.
The texture on the east wall in polygon 93 (and the rest of that stairwell) is not a wall texture, it is a fence texture. It will cause texture smearing on certain graphical settings. Change it to something else.
The water moves too fast. Change the speed to somewhere between 0.001-0.005.
Make an original map next time, or at least pick a less boring game than Heretic to crib from.
Heretical Cyborg is VikingBoyBilly's first complete single player map. It is also customized for co-operative play. It is modeled after the first map of Heretic, E1M1 "The Docks," and is an attempt at remaking a Doom-engine map into the Marathon Infinity Engine.
It started off as an entry for Kill Them All: Volume IV, but the polygon count went up too high. Instead of letting it go to waste, here is this completed standalone map for you to play.