<blockquote>1. Remove Joomla flavicon (is that right word) from browser tab?</blockquote>
Just replace the favicon.ico with your new one.
<blockquote>2. I’d like to remove the reference to Joomla from footer?
</blockquote>
Yes, you can do by editing the bottom lines in the index.php file of the template.
<blockquote>3. In future I’d like to have clients send me pictures of their animals which i’d then display in a photo gallery…… how do I go about setting up this – is there a module you would recommend?</blockquote>
There are a lot of available extensions to do that. You can find some at http://extensions.joomla.org/