You should host your image somewhere, like imgur and display it directly using [img] tags. Will definitely make it quicker and easier for people to see and reply.
There are a lot of problems that you could easily fix. Not to sound rude, but I'm unsure where you are going with the mesh itself. I understand you want to make a grime covered dungeon wall? But the mesh pokes and protrudes every which way.
The texture has a ton of empty, unused (therefore wasted) space. You could use that area to get a crisper and more readable texture over all.
If you haven't yet, I suggest you take a look at the wiki
which is an awesome bank of knowledge when it comes to this stuff. Start there, iterate and refine your work, and post back for some feedback.
Here is a few places to try first;
Mega resource for environment stuff
Modular brick wall
and another wall
great resource for material creation