Hi Mehtaz
Thanks for the reply, a lot of websites now give you the option to upload two different versions of the image you want to display dependant on what device. Resizing images does not always work and sometimes having two different compositions or even two completely different images work better.
Option 1
You upload PC based image and have an option to upload Mobile based image and dependant on what device is viewing it would select what to display. (shopify do this in most themes)
Option 2
You upload a PC based gallery and be able to set it only for PC devices and upload a secondary gallery for mobile.
I prefer option 1 as you only need 1 gallery and can see each image as you go. Please let me know if you need further info