I highly recommend 'downsizing this' and putting in your unique 'pretty font' that you use for the Site's logo as 'debate' and 'art' ('debate' on the left-appearing speaker and 'art' on the right one).
These are royalty free as in 'pure royalty free' so even using them is free. I got them from a specialist site dedicated to putting copyright-free images out there.
Some 'royalty free' images limit you to use it freely only if your site doesn't get ad revenue or financialyl benefit you in any official manner. This is 'pure royalty free' so long as you never ever state that the original photographer or pixabay are directly approving of your site or what it stands for.
For more information on the very specific 'pure copyright-free' nature of the images on pixabay look here:
I have helped a neighbour of mine create the logo and even motto of the company they run which helps local teens and young adults from rough backgrounds get into the mechanics industry (so criminal records, kicked out of school etc gives them a hope in life). I won't reveal what the brand is as that will help you track them down and then inquire as to who I am but I 100% was involved in helping them design their logo. In doing so I let them know a particular wrench they wanted to use would get them sued later on even though it's fundamentally a charity they are setting up and helped them which they thanked me for immensely.
I know what I am talking about when I saw something is totally free to use. The image of this logo is free to use.
I recommend the free program https://pixlr.com/editor/ [you can't use the editor if you don't white-list the site on your ad-blocker]
to edit the image. They in no way at all watermark your images. What they will do is (beneficial to you) deny helping you in any shape or form if you say you used it to edit the image.