Hold hard, there, PeterH

Let's say I'll give a
provisional definitive answer ...
First up, I think all three are quite OK. There are a few very dangerous fakes of these stamps (the so-called Brighton Forgeries), but we'd need to take highly detailed measurements to be certain. These, though, do look genuine on the screen.
Peter has identified them correctly, of course:
The red 4 Anna of 1879, SG 129: a nice stamp - Gibbons prices it at £13. The
faux perforations are actually part of the design on this stamp and its companion 8 Anna. Here is a sheet of the stamp:

If you have nothing better to do with a couple of hours

you could try to plate your copy. Each stamp in the sheet was engraved separately, so you can work out which position a single stamp came from.
In the earliest days of this series of stamps, in 1878, Jammu & Kashmir experimented with perforating them. It was
not a success. They perforated a few of the ½ Anna value, like this,

but then basically gave up on it, apart from the occasional sporadic attempt (all of which are scarce to rare).
The next stamp is a ½ Anna Official. From the look of it, it's probably the cheapest variety

, SG O7, the wove paper type of 1880. However - never say die -
do check the paper it's printed on. If it's
laid paper (with a watermark of close-spaced parallel lines), we're onto something better. If it's a thinnish paper, rather like that of the 4 Anna, it's from one of the occasions when the printers bought a small supply of laid paper by accident, a few years around 1890, and it's SG O13, and worth £5.50. If it's on a thicker, rather good quality, laid paper it's from the 1878 printing, SG O2 - and it's a £110 proposition.
The last stamp is a 2 Anna of 1883; I'd make it SG 153, the variety on yellow-green paper. The coloured papers the printers used for the 2 Anna value are mostly pretty flimsy. Gibbons rates this stamp at £4.25.
Jammu & Kashmir stamps are quite involved, but full of interest. Only those with very deep pockets can consider taking them very seriously, but you can build up a representative showing without causing too much damage to your bank account. If you'd like to read more about them, this
http://www.kashmirstamps.ca/index.html is a super Web site.