Can you please give me some hints to add fifth image in the center of whole collage.
Regarding 5th image (center image)
Hey @shivankkhare1, let me give you some hints. First make sure the size of the center image is resized to (100,100,3). Then you can take a bigger image of (430,430,3) having all pixels as 0. Now you just need to copy the pixel values of all the other images(copy the numpy arrays) to this (430,430,3) black image. In this way your padding will also be taken care of and center image itself will overlap the four other corner images.
I would suggest you to experiment by taking a bigger black image(all pixels 0) and copying the image one by one over it. Try plotting the image and see the results. You would understand it easily !
Still If you feel something is not clear to you, you can ask me anytime 
Hope this helps !
Happy Learning