Brahma eggs are lighter colored (tint to light brown), so that's half the battle (trying to candle dark Marans or Welsummer eggs is almost impossible, at least for me...just tried that with my Marans).
You've got very fresh eggs, and they were set quickly (perfect for hatching).
It is recommended to candle at 5 days and 10 days. It's not essential you do it on those days, you can do it anytime (except the last 2 days as that's lock down). You won't see much beyond 12 days as the chick has filled the egg up so all you'll see at that point is dark blob and white air cell. You want to see dark solid blob...not shadowy grey that rolls around as you move the egg....and clear air cell space for viable eggs.
I generally do my first check anywhere from 3 days to 5 days to see if the eggs are fertile. If I don't see any signs of growth at first, I wait a few more days and recheck. If you don't see growth by 10 days, toss that egg (I wait longer than most "just in case"). Tossing infertile or "quitters" is important, especially in warmer weather, as bad eggs can explode disgusting gook all over the growing eggs. Most hens clean it up, but I like to save mom the mess (and me the smell until she does clean up). Some panic and try to take everything apart and sanitize it all, washing the balance of the eggs if a bad egg explodes, but I have had eggs go bad with nearly every hatch and still have very good hatches with the rest with just some quick tidy, replacement of bedding, and momma doing her job. I find the soft alfalfa/timothy hay (from pet store bedding) over deep pine shavings is especially effective for providing a nice nest that is easy to tidy if something goes amiss.
I am really, really low tech in my candling. I have a very bright LED flashlight from the Dollar Store (don't laugh, it works great) and go out at night, stand by the nest box, cup an egg in my hand with a "C" shape so that I can hold the egg but shine the light up through it from the bottom. I will also gently roll the egg so I can shine through all sides to be sure to get the best idea of what is happening.
I have brown egg layers, and low tech, so I usually see just a dark dot and zippy veins on the first week. After the 2nd week, I just see a growing dark blob and white air cell. That dark blob gets bigger and the air cell gets smaller and centers into one end (forget which at the moment) as the hatch progresses. After 15 days, I can hardly see much than big dark blob. (YIPPEE).
Here's a great candling chart...it was done with very bright high quality lighting and inside conditions, so you won't see what is in the photos (unless you go hi-tech too).
Have fun!
Lady of McCamley
Awesome candling chart from a fellow BYC'er:
https://www.backyardchickens.com/t/...g-candling-pics-progression-though-incubation
This is more of what I see with photos of a non-fertile (grey yolk shadow only) and then a "quitter" that started but failed to develop (blood ring) and then what you hope to see those first few days...although I usually see the "zippy" veins too when I candle.
http://lancaster.unl.edu/4h/embryology/candling.shtml
Another site that shows what is good and bad:
http://shilala.homestead.com/candling.html
