Currently We have sliding hero images on the top of several web pages. We swap these out every month and track how many clicks each hero image had each month. Is it a best practice to track these types of clicks? It takes up quite a bit of time to report on these stats every month. We have noticed very inconsistent stats as well - what are best practices for design these types of images?
What are you using the Hero Images for? Typically I would have a corresponding Landing Page built and track the number of people going to the landing page to understand how well the promotion, offer etc was working and then you can track conversions if you were giving a free trial, or downloading a coupon, etc.
There are other ways to approach this depending on the application, but that is where I would start.
what are best practices for design these types of images?
Not to speak directly to the design question (I find hero images boring, or so says my conscious mind) but if you're also changing the text that's used on the image it's broader than "what's a cool image" -- you're pairing the image with a tagline, so it's a question of how catchy the text is and how well it's subtly supported by the image content.
But that's neither here nor there...
Is it a best practice to track these types of clicks?
It's a best practice to track all clicks, right? But as Chris notes, the question for internal links, where you control all the available metadata about the click, is whether to do source-based or destination-based tracking, and to not be confused by doing both.
Like Chris, I would err on the side of destination-based pageview tracking, with the links being source-encoded (with UTM or equivalent info in the query string). But you never know what C-level people will demand in reports. If they want to see "Clicks" then you've gotta do clicks.