I'm going to have to be a little blunt here and say I'm not overly a fan of either. the first one I like your expression, but I'd never bother to read the text in the middle. It's cleaner and "simpler" of the two, but there's way too much text in it, and even after reading the "title" of the thumbnail I still have absolutely no idea what the video would be about except maybe a snow blower review? but your face looks angry in it so I have no idea what's meant to be going on there.
The second one... I get what you're trying to go far, but it suffers from clutter. There's too much text, the white text suffers from one of the biggest sins in my opinion of never put white text with a white outter glow unless there's a REASON for the text to be clowing.
"when challenging things are way more fun" has potential, im not totally against the font but the background is cluttering it up making it very hard to read.
"Why do things easy?" has a lot of potential, it asks a question, but i'm not sure what the question is in context of.
And the photo is confusing me. It kind of looks like you're throwing a chair over a fence? and there's something that looks like a chicken coop?
I have absolutely no idea what's going on in that thumbnail which means I'd never click on it. I'd need more context to understand what the video is about, and if the thumbnail isn't explaining what the video is about in that much text, it's kinda hard to click on it.
You need to focus on "less is more" and context. You should be able to convey visually, with NO WORDS, what the video is about to someone who can't read, and then text is usually added as an emphasis
to what's already happening in the thumb. Look at Mr Beast.
Maybe not Mr Beast from 2016, but Mr Beast from 2019-2020.
Thumbnails are a tough thing to master.
hang ong... in that first one... were you ACTUALLY using a snow blower as a bench press? like, were you LIFTING a snow blower?