I need some software screens generated

I'm looking to get some software screens generated/designed. Its for our new website - https://advancesystemsinc.com At the moment the screens we have are a bit low res and not very appealing. I would like concept screens made up that look appealing , easy to use and functional. I want the screens to be superimposed onto an Ipad, and IPhone and a Laptop just like the home page screens. I also like the image of the hand holding the device and you can see the screen. Ideally, I need 3 screens that can are interchanged on the 3 devices (based on the home page). Is this something that you guys can do? At what cost? Thank you all the best Pierce