I'll use your bluebird drawing that we did here as an example. The first thing that you do is right-click on any empty part of the page. You'll get a list of options and in Firefox it will say "view page source" and in IE it will say "view source". Click on that and a page will open up that at first will look like gibberish to you unless you know HTML code.
The only parts that you care about are toward the top and they're easy to find because they have your title, description and tags in them. A few lines down (or about a dozen if you view it with the long line wrap option) you'll see:
<title>blue bird drawing kids wall art children room by wonderlaneart</title>
<meta name="keywords" content="Children, Art, Print, blue bird drawing, blue bird, bird drawing, fine art print, art print, children room decor, boys room decor, blue and yellow, blue, yellow, sun, kids wall art, childrens art print" >
<meta name="description" content="This cute early blue bird drawing will sing to your sweet children room décor. The 8x10 kids wall art is of a blue bird drawing from original" >
You can see exactly where your title and description are getting cut off. Google still reads the whole thing and it all counts but the part that gets into the description tag counts more. It's also what the preview will look like when you come up in google which is another good reason not to just have a long string of keywords. That looks weird to humans and google won't like it. Google wants us to write for people and let it figure out how to index it.
Unfortunately Etsy has imposed an arbitrary limit on how long titles can be and uses up a bunch of that space by putting our shop names in so this is why we recommend getting your keywords toward the front. Again, google is going to see your whole title but the most important parts need to get into the title tag for the most benefit.
Did that make sense?