Would be cool to be able to change the default "Search here..." to whatever we want (e.g.., "Search", "Search from our gallery..."
You can use the translations prop available on every widgets to achieve such a thing. You can read this guide to have more information about it: https://community.algolia.com/react-instantsearch/guide/i18n.html.
Also every translations keys supported by a widget are listed under the API section of the community website. For the <SearchBox/> you can have a look here: https://community.algolia.com/react-instantsearch/widgets/SearchBox.html#translations.
Let me know if this help!