I presume (without knowing your websites details) that you need to take your efforts a gear up. Meaning, it seems that pagerank is important to you, though I will encourage you to focus on doing all the right things, like, updating your content and make it speak to the needs of your visitor (allowing them to place themselves in to the realm you communicate) also, re-checking your websites overall status, (broken links are important) since at times it is easy to lose track of this important factor.
Have you optimized your websites images? meaning, can you achieve same or similar quality images with smaller sizes? if not, look into it. Have you utilized naming your images thoroughly? My best advise will be to NOT play too much with alt description focusing on keywords ONLY.
Since the usual information online about image names and alt tags for seo is very well misinformed.
Let me give you an example on how to achieve super-powerful image names and alt tags.
Let's say I want to target a page with keywords as such "seo" "seo services"
Then images that I may incorporate within that page (this surely will depend on the information you want to portray) may go something like this;
image name within a folder called
which also has another folder named
with image file name
which then has an
alt="Google search results for seo services"
since alt is like describing the image in an alternative manner.
See what I have done? instead of naming my image "seo" and with alt tag "seo" which semantically makes no sense.
And because you are talking about the latest updates Google has attended, this simple example will give your website a shield and build strong foundations while allowing it to be future proof.
By the way, this information is rare to come by about the latest updates, so use it well.
Hope it helps you greatly.