Opinion on my first thumbnail?

[Turtle]

Looks alright, maybe could use something else to make it standout from the other thumbnails

 

[GameJam]

Don't use the magnetic tool, if you get good with the pen tool, you can make both closer and more accurate cut outs.

Pen tool
right click
make selection
copy
and past on a new layer BOOM

 

[Matthew Eldridge]

I know it's after black friday now but I think it's good, especially as a debut, they come up smaller on the YouTube feed so it doesn't have to be perfect

 

[ItsNateOnline]

Hey man. If you wanna know how to better take yourself out of a picture for a thumbnail, check out a video named "Photoshop CS6 Extracting Person and/or Object Professionally from Photoshopisfun. It's a great tutorial! It's where I learned from