Well, you're not going to like my opinion of this.
Grids? Garbage design! multiple perfect width perfect height elements? Garbage design! Designing in pixels? Garbage design! Header logo larger than some netbook and ultrabook screens? Garbage design! Design that's more than 2600 pixels tall? Garbage design and too much **** on one page. (hence why that whole parallax thing that's trendy right now is accessibility and usability rubbish) Playing around with layout before you have content or a reasonable facsimile of future content marked up semantically? Do I have to say it?
What you have done isn't web design. You've drawn a picture in Illustrator that begs a number of questions:
How is it going to expand on wide screens?
How is it going to re-arrange itself on small screens?
How is it going to elastically expand or contract to fit the users default font preferences?
What you have is what happens when a print designer or graphic artist decides they want a website, without learning about web design first. There are a whole slew of accessibility rules (called the WCAG, web content accessibility guidelines), as well as rules about HTML and CSS you should know BEFORE you even THINK about what the page is going to happen to look like on the screen in front of you.
... and with a well written website, what it happens to look like on your display may have Jack to do with what it looks like for someone else; that's what "responsive layout" is supposed to be about.
My advice, learn what websites are and what they are supposed to do BEFORE you start playing around in some goofy paint program. That means HTML, CSS, accessibility, semantic markup, separation of presentation from content, progressive enhancement, and a whole slew of other things that are required if you want to build a website that is actually useful to visitors.
... as opposed to something flashy looking on your display, that's ultimately useless on anything else. Again as I often say, people visit websites for the content, NOT the goofy crap you hang around the content. That's a bitter pill for artsy folks to swallow (I was there myself a decade ago) but at the end of the day the BEST layouts and designs are the ones you don't notice as a visitor! Why? Designs are NOT what you are there to see on a website. CONTENT IS! If you notice the design, there's probably something wrong with it!
Basically, a website should be like Bruce Lee's bit about water. You pour it into a cup, it becomes the cup. You pour it into a bottle, it becomes a bottle. You pour it into a kettle, it becomes the kettle.
You load it onto a desktop, it becomes the desktop. You load it onto a tablet, it becomes the tablet. You load it onto a phone, it becomes the phone.
That's basically what elastic semi-fuild responsive design built with progressive enhancement -- the PROPER way of building a website -- is about.
No matter how many sleazy scam artists in the industry fill "houses of ill repute" like ThemeForest and TemplateMonster with their bloated, slow loading and ultimately useless crap to bilk people who don't know any better out of their money.
Be like water my friend...