I played around with image sizes. Obviously those icons won't be nearly this large in any of the screens/pages they are displayed.
Here is a small version that I think may be appropriate-ish size for displaying on the web, and maybe in some screens in the application:

Still looks pretty good, though the yellow arrow is a bit harder to see on the white background.
Here is realistically about the size they will be on the actual cards:

Now the yellow arrow is barely visible over white background. My thought is that we should use a darker color, maybe orange or green.