To add to the things said above, you really shouldn't call your guide [Master tier] if you aren't even close to it now. It's very misleading because if you're Diamond 4 now, you really don't have the skill level of a master tier player any more.

You should explain your reasoning behind picking Teleport over Flash.

Demand for explanations when it comes to items: Why do you exactly pick these items? Why do you build such an utility-based item like Turbo Chemtank but don't even mention Locket of the Iron Solari?

I was able to count the pixels in the pictures used for abilities and items which tells me that you should use the coded version instead:
[icon=Cursed Touch size=20] ->

Let's talk about gameplay a bit more. You've already included information concerning jungling yet there isn't much more information about team fights and objective control despite the videos.

This guide is extremely helpful to newer guide writers. I share this guide over and over again and I'm already gettin' tired of it but if you as the author really want to put more work into your guide it's definitely worth the read. Feel free to ask any questions!