I'm not 100% sure, but i think you used Topaz effect there? At first glance, it might be tempting to overuse such effect, since it gives a nice clean feeling to your artwork, and from that point of view, one could only believe using more of it makes the art work better. The good news, we all had it that way at first, then realized, it's actually best to only use a very small portion of that effect, since you don't want to remove all those textures for the sake of some lines. What Topaz effect does, it removes all hard textures and smooth out the art work, then it sharpen (while still smoothing) all of the black lines in your artwork which gives it a very unique feeling, but as i said, it's only pleasant to the eye when it's not used too much. Make your own custom setting, something that could work on all art works, while at the same time, doesn't remove your artwork's textures.
