This is the photos I blended

>> Step1
Open your main image in PS , and turn it B/W , (Image/Adjustment/Desaturate )

>> Step2
Add the first texture to the palette , ( open the image and drag it into your palette or copy paste it )

>> Step3
Change the blend mode to multiply or anyone you like , each blending mode is has different effects , you should check them all out ,

So far it looks like this

>> Step4
Add a mask to the Layer 2 to clear up the iris and white surface , to get better effect it is better to use the soft brush and keep the opacity low so your mask get softer

>> Step5

Repeat Step 2 3 4 but using now textures 23 and rename the layers to Texture 1 , 2 ,3 etc

It should look like this so far :

>> Step6

I want to add some color to the iris so , Open the eye picture again and crop a square enclosing the iris , paste it in your palette and make it match with the original iris , (this is easier than it looks) , then erase with the soft brush the edges and play with the (image/adjust/brightness contrast) and (image/adjust/color balance ) so you get your desired tones