I have found issues where I have to Mark Freestyle Edge or make a new edge close to the one I want as a line and mark that edge so I can get a complete line render. But there are instances when parts of lines does not render that looks like they should. Many of those times marking a edge or putting a new edge close by and marking it won’t help. Every time I try to use Freestyle there are issues and as I learn to use Blender more, I will make bigger and more advanced scenes and probably have more issues. I want to use Blender to make Line Art for Comics style projects. I want to understand what is going on and what I can do about it. I’m also open to alternative solutions then just using Freestyle. Here is a example image of the kind of problems I’m badly trying to explain. 
Anyone else having Freestyle and other line rendering issues?