My standard for sci-fi and fantasy covers is "not embarrassing to carry on the bus." They usually depict some kind of too-cool hero clutching a gun, sword and/or a hot babe. No thanks.
The original covers for the Kovacs novels are pretty bad -- a mix of cliche grunge design and old cyberpunk. I decided to go abstract with these, trying to create a mood with shapes and colors rather than depicting anything specific from the books.
Abstract FTW. I find that most science-fiction cover imagery (including that on the existing Altered Carbon cover) to be either random, lame, misleading or disappointing based on how I imagine the book. These are nice, distinctive, and enjoyable to look at.
Your cover also has the virtue of having readable text, something I now notice escaped the paperback cover designer. Yellow text on a yellow background? Well done, random cover designer. Those footsteps you hear belong to John Harper.