The request for general info is confusing a bit.
What catalogue are you using, if any? Does it matter which catalogue numbers someone answers with? Which currency? I assume you wish US currency
Australia has their own specialized catalog, actually a few different ones. Then there are the Stanley Gibbons world and Scott world catalogues.
With older stamps such as these, if you are trying to determine value, it is sometimes (for some) to check the details of the stamp, the perfs, the errors in printing, re-entries, special cancels, etc etc.
A gheneral value will give you just that.
Example, the last stamp (#25) is from South Australia (obviously), a country of it's own before it joined together to make the Australia we know today, and had it's own stamps. Lots of older countries are like that.
I only have a general Stamps Of Australia by Rennicks catalogue to go by and it is a 2d Orange generally from 1868-1911 (in this general catalogue). No mention of special errors or anything here in this catalogue either. Worth used $5.00 and that is in Fine F condition. Yours is not in fine but in Good if that because of the design touching and entering the side perfs, the clipped corners upper right and lower left, the nice cancel (to me) saves it from being trash. Being an older stamp saves it also as its relative rarity would make it interesting to someones studying these, or the cancel. This is assuming that the back is not thinned or stamp has no hidden faults. Price now would be approximately $1.00 because of the damage, cancel saving it (perhaps). Some would not want it because of the damage.
On a modern stamp such damage would make it garbage to most except the real stamp lovers out there.
To continue on to the first pic, the King George Fifth or KGV side faces, 1913-36 years, there is a thread on Stamp Community (search) about just them and their possible variations and errors. Quite fascinating. Also, beyond even that thread, there are colour
variations that are worth more or less if you collect them.
1 - 1d green 2.00
2 - 1-1/2d red 3.00
3 - 1d green 2.00
4 - 1d red 3.00
and 2d red 4.00
5 -
6 - 5d brown 15.00
Proices given are for Fine Used. Your 5d is not fine, but good, to my eyes, but nice cancel, worthy.
These are one catalog's values. This doesn't mean that when you sell them you will get anywhere near that price. Depends on who you sell to, where and when and how you sell them.
Centering is important (most of yours are poorly centered). Light and readable round cancels are important. Type of cancel. Etc etc.
I like details (at times) and this series has enough details to last me years and years.
I do not mean to be super picky but am not sure what exactly you want to know. Are you just wishing to know general value for your own pleasure? Wjich stamp has the potential to be the lotto winner for you? Or just curiosity? Or are you selling perhaps?
If selling, the more you know, the more you research and find out, on
ebay, through catalogues, through searching on Stamp Community and elsewhere, the better off you will be.
Example some make a study of the 2d red KGV stamps. Just that one stamp. Cancels, shades, errors, etc. Quite the hunt. If you can recognize and tell a sellable stamp from an ordinary nothng special about it stamp then you have one up on the other sellers and people will coe to you to buy.
If you are just selling lots of stamps in bunches then you are letting the nuyers determine the value and they will. Centering, colour, cancel, eye appeal.
Catalogue may say 2.00 but real life selling it sells for 50c or less. If damaged or not perfect or heavu cancel then good luck selling it except included in a group.
Gee I am seeming down today on stamps selling.sorry. This is just facts and real life. Cataloguies are there to give you a value of what a dealer would sell a stamp to you for if it was in really good condition and you were buying just that one stamp. Stamps regularly sell for much less than catalog and sometimes more if in superb condition or something special about it. That takes study to determine.
Not sure where you are in your knowledge of stamp values or sales or collecting.
Some of your stamps have the corners clipped or pulled off or missing. These are generally garbage now.
17 - 2d Orange is 5.00 with the round cancel but nope only probably 3.00 with the wavey lined cancel. Eye appeal. Oh, wait, the round cancel saves it but the centering is bad, really off to the side it is. Hmmm, loss in value again. 2.50 but an auction for the cancel, if rare enough, might sell for more. I like cancels but don't know the Aussie ones (yet). Research research. Look on
ebay or Delcampe to see what the cancels sell for for a 2d Orange HGV.
I say 2d as that is how it is written . It is 2 pence or pennies. The D is an abbreviation or the Latin Denarius or penny.
18 - Western Australia swan, not sure, need better 600 dpi scan of just this stamp on a dark background please for others to help.
20 - minimal (catalog minimum 50c but cancel nice so could sell 1.00 for that alone.
23 - 3d Blue HGV 5.00 maybe, perfs on left not even, want to see the back (I always want to see the back)
24 - 2d Adelaide , minimal 50c, nice cancel, perfs short on top edge.
21 - clipped otherwise 2.00 nice cancel
22 - 1.00 but corner clipped