I think the blending is good, in my opinion maybe a little to much going on in the first and second photo. Like in the first one maybe i lose the mount Rushmore and the second only keep the bigfoot (monsters)
Hello and welcome to PSG. Thank you for sharing with us.
I can tell that your relatively new to Ps but I believe your off to great start! Keep up the work and practice, practice, practice!
Posting more than one example makes it hard to offer any suggestions because they all would require a fair amount of time to cover. In the future, you may want to only think about posting one image per thread so it stands a better chance of receiving individualized attention.
In the first 2 images you have overused the "out of focus" in your depth of field. The last image is the best both in composition and execution other than the main subject is lacking any shadows that tie him to the floor.
Overall, not a bad job!
I can see you that you need to work on cutting out objects, blending, and creating shadows.