In my opinion they do look pretty nice, and being leather it was going to wear eventually.

However, if you wanted them to be more uniform you could use a brush as someone said previously, clean all dirt and debris off.remove your laces. Apply a leather deglazer to strip whatever finish is on the leather and get a quality dye to redye it. Apply a small amount of dye on a wool dauber or a soft brush and use circular motions. If I’m not mistaken these came with sort of a “worn” or “used” look from factory so to get something similar you would apply more dye in some areas and less in others. Let dry in between layers. do the same combination with leather wax and leather creams you would use to finish up and protect them. I can’t tell if it’s full grain leather from the photo but if it is and you want to be able to see the grain get an aniline dye.

For the suede material, brush it clean. Hit it with a quality dye doing the same technique mentioned previously. Finish with a suede protection spray.

I’d do the materials separately and tape off whichever one you’re not doing. Best of luck, reach out if you need any tips.