The site still needs improvement
Below are some points that I felt worth mentioning
The images(illustration) are not sharp.
They are not clickable
There is no way to preview or download the illustrations
I haven’t checked all but on first look it seems that some illustration belongs to some other websites and they have their logo’s watermark on them. I am attaching snapshots of some of them below with logo marked in red. I don’t think it may be legal to use them on your website. The watermark logo is there for some reason
Providing it free is not even a question here…
As long as the content belongs to any other website which isn’t your own, it becomes compulsory to take their permission of using their images for your benefit.
They might be providing the images as paid(and that’s why we see their logo on some images) and you are just copying their images and providing it for free!!! This might be illegal.
Oh…then you should mention the same in your website’s About section on any other similar place and should be ready if someone ask to show the permissions.
If you have their permission, they might have provided you with the original images(without watermark). Upload them instead of watermarked one as no one will use images in their UI that are not sharp and have watermark on them!