Bad source links

I 'm always having problem with sources does anyone know how to get them in there to work right and how do I get them in now

I can never get source links to work I red flaged it I've copied live link and pasted they never work?

The blending on the plane looks good, but the two girls look very fake, try to desaturate them and reduce the contrast to try and get them to match. Good luck!

The girls look giant and not real on the pool.

I've changed original and step by step other plane had copy right I didn't know. I now know to look more careful and I'm happy to see sources when in this time and are woking.