Yeap, google should be crawling all your site naturaly.
Remember that bots have a finite time to crawl your site. It might be that there not enogh time for all yout images.
Even more, if you want to be stric with only high res images indexed, that's the main reason to use sitemaps.

And yes again, use different sitemaps, ona for images and one for pages.

Hi,

How old are the pages that you are tracking? Have you considered that SERPs will fluctuate for a few weeks since google indexed them?
Also, you should take into consideration that January has been a really windy month in the SERPs, that's because there have been many updates on the Google Algorithm.
Check them out here:
Google Algorithm Change History - Moz.com
Algaroo.com
Mozcast.com

You should also take consideration, as you've said, that your pages aren't optimized over SEO. 
I'd recommend you that learn about the major updates that have been over january and analize wether your site may be not suitable for google to rank you better.

Hope it helps.
GR

Hello there,

Watch out your question, there is a site there. If its your clients, edit it.

Canonical and hreflang seems OK. 
Blocking other languages/countries is wrong. There you are allowing google to see ONLY the us version.

For further reading, take a look at these articles:
Hreflang:
Multi-regional and multilingual sites - Google Search Console
International checklist - Moz Blog
Using the correct hreglang tag - Moz Blog
Guide to international website expansion - Moz Blog
Tool for checking hreflang anotations - Moz Blog Canonicals:
SEO Best Practices for Canonical URLs + the Rel=Canonical Tag - Whiteboard Friday Consolidate duplicate URLs - Google Search Console Help

Hope it helps.
Best Luck.
GR.

Hope it helps.
Best luck.
GR.

Hi Abdul,

Page titles are only one in the whole ranking factors. If you have optimized your pages for those keywords, it would be advisable to optimize and work on the other ranking factors.

Some further read is here:

Search Engine Ranking Factors 2015 - Moz.com
On-Page  Ranking Factors - Best SEO Practices - Moz.com

Also, have you tried the Moz's on-Page grader? Check your pages and your competitors pages for those keywords, pretty valuable information will come out.

Hope it helps.
GR.

So, every page of example.com/en-US/ redirects 301 to example.com/ ?

If that's the case, then there is no reason in having that folder (/en-US/), just when configuring Hreflang for en-US use the URL without that folder

that's corect.