[NSFW] Blog page customisation

Hi,
I am building a personal website with Photofocus theme (https://catchthemes.com/themes/photofocus-pro). I completed the website design, now designing a blog page. Actually, I need a custom theme for my blogs to see the design below.
Custom design example site: https://blog.bitdiscovery.com/

But Photofocus blog theme looks different(See image attached)

Following are my doubts?

How to customize Photofocus blog theme to meet my requirement?
Do I need to manually edit PHP files to achieve the design?
Can I purchase a different theme for the blog only(ie my desired design is also a WordPress site – https://blog.bitdiscovery.com/)
Suggest me the ideal solution?

Your help is much appreciated.

Thank you.