Lets' Start! 

Step 1.  Open up your GIMP and start with a landscape canvas with this size. 

& it should now look like this 

Step 2. Then get this TEXTURE & place it in. You might have to resize it to fit it to how you would like it. 
I just resized it to my liking and small enough to see the other details as well. 

Step 3. Then you add in this IMAGE of Luhan. 


after doing so, you want to Erase the outside part of the Luhan Image with the Eraser tool. 
Set the erase size to your liking, whichever size you are comfortable with but keep the opacity as 100. 
 

After doing that it should look similar to this . If you are having trouble making it blend properly, after erasing the hard edges,
you can now simply lower the erase opacity down to the 30-40- and erase the outside part again, that way it'll blend more naturally. 

Step 4. After with all that erasing, Simply go to 'Filter' & click 'Enhance' * then click 'Sharpen'. 
Make sure to set it to 40-50, so therefore it makes the picture more clear. 

Step 5. This time you ad in this IMAGE of IU.
And simply just r