The simple answer is no – search engine submission isn’t necessary. The majority of search engines nowadays (most notably Google) crawl and index pages by following links. Using that logic, a single inbound link from any already-indexed page will identify your page to the engine. Subsequently, if that page links to other pages within your site, they will also be indexed… and so on.
When assessing page structure and layout, there is a subtle, yet strategic way to use images in an SEO-friendly manner (beyond ALT tags) that improves your search rank while allowing you to integrate the necessary marketing message(s). Confused? Let’s look at an example:
Suppose you operate a travel site and you want to optimize a given page for the term “Las Vegas hotel”. Suppose that you also want to include an enticing marketing message such as “Book now and save 20 Percent!”.