1. SEO / Google is a chapter of its own, and in most cases you wont really have any chance of showing up with generic terms of real English word combinations, unless the search phrase for example contains your name "Ben Woodham". I checked your site, and I noticed you have the TITLE
<title>Ben Woodhams</title>
Basically, TITLE is the most part of your search engine optimization. Its mainly the part where google indexes what you are all about. As long as it only contains your name, Google will does not know much more about your site. I would extend the title to 30-60 characters. For example
Ben Woodhams - Illustrations and Drawings Gallery ... etc
Then Google will eventually pick up on these words also.
As for the two other settings:
Description
This item doesnt benefit your SEO in any way at google. The only thing it does, is provide a description to human readers when they DO find your site in google. It will display in your google listing item.
Keywords
This I wouldnt even bother using any more. Google does not use this to rank web sites. It was only used by older search engines (and maybe a few non-popular ones).
Basically, your TITLE is important, and then you should get some incoming links. Other than this, your search engine optimization is a little limited with a gallery.
2. Basically, there is a file "favicon.ico" in the root of your gallery. You can delete this file so it wont show up, or you will need a program to create a favicon for you. I found a few simple online tools for creating favicons here:
http://tools.dynamicdrive.com/favicon/
http://www.favicon.cc/
http://www.degraeve.com/favicon/
http://www.rw-designer.com/online_icon_maker.php
You can either upload an image and have it converted to ICO, or you can draw your own.
3. When you say hyperlinks, do you mean external links in the main menu, or links in some of your descriptions? If you have external links in your main menu, you can make them open in a new _BLANK window by adding the link with *_target behind it. For example:
http://yourlink.com/page*_blank
If you want normal description links to open in new window, you can normally do that with the WYSIWIG editor, but if you add manually, just use the target attribute:
<a href="http://yourlink/page" target="_blank">link text</a>