Trouble hatching

[kps76]

I asked for a small incubator from my parents for valentines day. I got one it seems to be working well and I see develope net on 4 of 6 eggs. One of the eggs looks like the development and veins are popping out of the air cell/sac. One of the eggs has large veins around it and two have small bloody dots with tiny short veins coming out. Is this all normal? Two eggs are serama and two are silkie mixes.

 

[Yorkshire Coop]

You don't say what day you are on with your eggs? Pics are also helpfull. Here is a link for some candling pics https://www.backyardchickens.com/web/viewblog.php?id=230

The further along incubation the bigger or more prominent your veins should get untill the chick takes up most of the egg and then you can't see the veins aswell because of the chick.