For the favicon, you need to use an image editing program like GIMP or Photoshop. Create an image 32x32 pixels and create to your heart's content, then export as an icon (.ico) file.
For the OpenGraph image (og:image), I would recommend a size of around 600x420 or larger. You can edit it in GIMP or Photoshop as well and export it as a PNG.
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For the favicon, you need to use an image editing program like GIMP or Photoshop. Create an image 32x32 pixels and create to your heart's content, then export as an icon (.ico) file.
For the OpenGraph image (og:image), I would recommend a size of around 600x420 or larger. You can edit it in GIMP or Photoshop as well and export it as a PNG.