@celson.aquino I’m probably not the person you want to hear from because I can’t directly answer your question. However, I used a 500x500px image and it looks amazing. The resolution is great on both the favicon and app logo.
You can use any logo size you like but the default is 512x512 which is the best size for PWAs.
Likewise, the default favicon is 16x16 but you can use any size you like.
We don’t have a recommended image format for the logo but here’s a useful guide if you’d like to learn about compatibility on the web and the pros/cons of popular formats: Image file type and format guide - MDN (mozilla.org)