The color of the eggshell, how dark it is when and where you candle, and the strength of your light can affect how well you can see. Experience helps too. Especially in white eggs some people can easily see development by day 3. Light brown eggs aren't too bad. With my dark green eggs I have trouble seeing much detail at any time.
Don't get too worked up about details. It's fun if you can see details but early on if you see veining it is developing. To me that's enough. When I go into lockdown I'm mainly looking for a dark blob and the air cell. If I see any movement at all that's a bonus. Until you gain some experience don't make dramatic drastic decisions based on candling. Sometimes you get surprises.
Don't get too worked up about details. It's fun if you can see details but early on if you see veining it is developing. To me that's enough. When I go into lockdown I'm mainly looking for a dark blob and the air cell. If I see any movement at all that's a bonus. Until you gain some experience don't make dramatic drastic decisions based on candling. Sometimes you get surprises.