If you have different variations of 3D elements, like those brambles, then first of all sort out those ones that are naturally best suited to your design.
I picked those bramble versions that worked nicely to build up the heel and top of the shoe.
There are three things you can do to make 3D elements blend in seamlessly.
First of all, you can use Photoshop’s scale function to adjust the size. Go to Edit > Transform > Scale. You can also press Command + T (Mac) or CTRL + T (PC) on your keyboard to call up the Scale tool.
Once you’ve resized the elements, you can make further adjustments to change their shape.
Most of the time, I’m using the Distort function. This is how I made the brambles ‘hug’ the heel and the instep nicely.
To call up the Distort tool, go to Edit > Transform > Distort and play around with the distortion pointers until you’re happy with the result.