It's quite good, I can't tell much from what I've read. It's still building up the story.
Some comments I can give are
- it's a bit overwhelming, I'ts like a book where you need to return several pages to follow the plot once and a while. Can't really say what comes afterwards, but you might break it up a bit what you've got now. Introduce the characters and history little slower with some some descriptions of irrelevant details, so your readers know the charaters better/
- Also specify a date/time when the Marsh family was murdered or at least their bodies discovered. Now it's quite hard to understand the impact the picture of the hand had. Did he receive it before the bodies of the marsh family were found? Long before? or after?
- Graphical I see some, not much anatomic flaws. No real problem, just something I spot easely (did my part of human sketching etc when I was young)
