Ann87 is right, we need more info regarding your platform: Wordpress, Shopify, Squarespace ?

- A plugin that makes pictures publishing on a website more simple. I mean, the one that can reduce pictures and so on.
Most of the time, it's easier to just do it in your local photo-editing program like gimp, Or if you on Linux, there are many "one-liners" to just resize in bulk

- A plugin that will allow me to add reviews to my site.
DISQUS and TrustPilot is one, the thing with reviews+comments is you want one, with proper spam filtering !