Not sure if this is of help to you, I suppose it depends how many pages you are expecting to be indexed, but according to John Mu at Google - Google does not necessarily index all pages.

https://www.seroundtable.com/google-index-all-pages-20780.html

To me that sounds pretty good, providing it is relevant to to the image and provides genuine context it should be fine, I would however, consider - "wedding ceremony at venue" borderline - especially if it is in every image alt on a page. Try change it up a touch - if you cannot tell from the picture that it is at specific venue then maybe not have it in there, say for pictures with a shallow depth of field and the background is not easily identifiable, rings, flowers, tables placings, closeups and a like.

I believe what you are doing for your Alt text is great - make it describe each image individually.

As for title I would use it to further describe each individual image rather than duplicate for all in the blog post imagery. This is mainly used for further improving UX on each image.

Alt text is the most important from an crawling/seo perspective as is often used in collaboration with the surrounding text to determine context. Be wary of keyword stuffing in your alt tags.

Hope that helps.

You could always trial a service like mention.com - It will allow you to track specific content across a variety of locations including FB and Twitter etc. It is a paid solution, but you can get a free trial.

So people share a specific link or bit link - hopefully you can track it.

I personally use a number of tools, MOZ bing one, Google Search Console, SemRush, and SeoPowersuite.... as for managing my social my personal favourite is Buffer..... where i manage, FB, Twitter, G+, Pinterest, Instagram and LinkedIn.

Along side your content for your blog, ensure you try to answer commonly asked questions, this can help to position you in P0 (knowledge area) if answered well.

A great tool to use is answerthepublic.com where you can see what common questions are asked around you main terms. Adding this great unique content either on a blog or selection of FAQs could be beneficial.

Sitemaps are limited to 50MB (uncompressed) and 50,000 URLs from Google perspective.

All formats limit a single sitemap to 50MB (uncompressed) and 50,000 URLs. If you have a larger file or more URLs, you will have to break it into multiple sitemaps. You can optionally create a sitemap index file (a file that points to a list of sitemaps) and submit that single index file to Google. You can submit multiple sitemaps and/or sitemap index files to Google.

Just for everyone's references - here is a great list of 20 limits that you may not know about.

20 Google limits

I think the following posts will cover this topic on images for seo and hot linking. I would imagine the problem you face is that it will be eating into your own servers bandwidth by serving these images for someone else.

https://moz.com/community/q/can-hotlinking-images-from-multiple-sites-be-bad-for-seo
https://moz.com/community/q/seo-issues-from-image-hotlinking
https://moz.com/community/q/images-and-seo

Cheers

Tim

According to the following post fro WIX (not date stamped) - click here

"While it is currently not possible to manually add a markup schema to your site's source code, some of the content on Wix sites, such as blog posts and eCommerce, is already marked up in accordance with schema.org. "

From this I can only assume despite some schema being implemented, additional features such as Ratings will not be possible. They do appear to be trying to collect votes for this to be a feature.

This is one of my main issues with WIX, you can create great looking sites and SEO has improved, but for me having a custom build allows you to be much more, proactive, planned and reactive to the challenges that SEO offers up on a daily basis.

Hope that helped.

Further to David and Egols, comments , agreed forcing too much schema and slapping it on everything is probably going to reduce your chances. On the whole the majority of places where my Ratings appear are product related with a genuine identifiable source.

You can use pretty much most aggregated data for your star ratings. Although I am unsure if they will block some sources, especially if you have stated the source as FB (although looking at your results that is not the case).

Secondly, despite having your schema attached to your site and with no errors, Google does not necessarily have to display it, one day it may appear, the next it may have gone, luck of the draw. If you have only added it recently, give it a bit of time.

You can find more on aggregate rating here. http://schema.org/AggregateRating