Mobile images adaptation Options

[Silentwabbit]

Good day mates.

I am sorry if I am doing this a wrong way or if I am asking a possibly stupid question, but I've been working on updating one site and I've been having a set of problems I have never encountered before. Most of my problems come from how android mobile phones perceive and implement site's design.

The site is: www.hostelbgd.com

The problems I am having with images are:

1. On the index pages the flexsliders images are not scaled well and I only get one piece of the image on mobile devices. Mostly I get only corners of the images and quite zoomed versions of them.

2. On other pages there is always a header image which isn't displayed on mobile devices at all.

I know it's quite a lot to ask for first time on the forum, but I don't know who to turn to anymore as tutorials and solutions I found on internet were not very helpful.
I appreciate any and all comments you have and am thankful in advance.

Best of wishes,

Stefan.