YES GOOD CONSTRUCTIVE CRITICISM GUYS :highfive:
What really iffs me about this, is that it seems like you got two renders, to images and just pasted them onto something then added some text and a border. Nup. Looks ugly. Few ways you could've made this better:
Color scheme -- makes it look a LOT nicer, and helps blending to make it look like one signature, instead of a rectangle of images.
Sizing -- What's your focal point? Your render? Make it the focus. The left picture is the biggest, and it's part of the background. Would've been k if everything was blended into the background, but you gots two Cahill's there looking all pretty out front.
Blending -- This has another line because it takes a while to get used to. Only way to get better is to continue practicing.
Sorry if I wasn't much help, but idk how to work PS, I mainly use GIMP, soz <3
All in all though, even so it wasn't your greatest, it's not THAT bad. If you wanted 4 pillows, you get a blanket.