Image slider (to be used in Muse) with links and variable image width

I'm really hoping you can help me on a project that frankly has been driving me bonkers!!

I'm setting up an online art gallery, over the last year I have used Wix to build a site (explorersglobalfineart.com). Initially I thought this was a good idea as I could build the mobile site alongside the desktop site. It turns out the template features are appaling and every time I add a new page I have to reposition everything on the mobile site.

So, in the last month I've been looking into Adobe Muse. I've started building the plan for the site and added artists pages but there are pages on the current site that feature a carousel slider with the ability for variable image widths that I just can't emmualte in Muse – http://www.explorersglobalfineart.com/#!asia/cfvg

I've serached and searched for a suitable widget for this slider, I even signed up to a company called Muse Themes as I thought they had a suitable slider but it doesn't allow for variable widths of images.

Would you be able to help with modyfiying current widgets or building a slider/slideshow in another programme that can be dropped into Muse? If so please could you let me know how much this would cost?

Many thanks,

Rebecca