Hi @Yashi
Just to clarify, your images are not showing on the single page? That is most likely because of the code you have written. There is no need for a new WP_Query on this page as it is a single page. The global $post object is already setup.
I think you should read over the WP docs to get a better idea of coding WP themes before jumping into the deep end of ACF dev.
Thanks
E
