Can I switch off labels in responsive banner slider

I just want to show the images in the slider because I want the banner to be small.
When I make the banner small, or even in normal it looks horrible.
Responsive is not realy responsive, because aspect ratio is not respected. Width on desktop and on phone look very different
Can I switch of the labels / text and can I keep aspect ratio?

Jos Wouters

I took it of because it looked horrible, but I have put it back for you to see.
www.enegslefordclub.nl (on the home page)
I tried all 3 types, but nothing worked correct. Now is Adaptor with height set to 150.
The size of the image is stretched with keeping aspect ratio. On the desktop it is almost square so the image is stretched in height on the phone it very low and wide so the image is stretched in length. As I said not responsive.
attachment is phone size

Sorry typo www.engelsefordclub.nl
Attachment desktop screenshot

Looks like nivo settings work.Then it scales.
I only have to take out transparancy out of the pictures.