How can I overcome "writer's block" while writing my comic book stories?

I want to expand each chapter to be big enough to fill an entire comic book. Sometimes I am too "direct" in my writing style and forget to fill in the details the way Tolkien or Robert Jordan or Mark Twain were masters of doing. HOw can I fix this problem?

In my chapter "Elementalist Superior" I don't seem to be having this problem, but in most of my other chapters I am having this problem. tjhe chapters are not long enough and detailed enough.
How can I overcome "writer's block" while writing my comic book stories?
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