Normally i'm putting only important link inside my sitemap which right now they are about 3985 and google has indexed 3501 of them.
But the exact number of my links are over 100,000 and with each link there is an image that i show it to my users.
So, should i put all my links including my images inside my sitemap?
Put every link you want search engines to crawl and index in your sitemap. That's the whole purpose of XML sitemaps, to tell search engines about your pages and images as well. 100,000 links and images are not a lot at all so don't worry about thinking Google will ignore your sitemap or be overwhelmed by it.