1: far too easy to publish on its own, but a very nice addition to a small puzzle pack like how you're presenting them together here.
2: nice one star difficulty puzzle
3: this one was kinda difficult for me compared to 2 and 4, possibly even a two star puzzle for me (although probably still going to end up as one star with the audience of this site...) and certainly not bad, but perhaps a bit too many tedious steps to my liking and not enough points in the solve where it either goes smoothly, or requires actually interesting logic. that's just how i feel about it though, i wouldn't be surprised if some solvers love that style of tedious slow progress.
4: a couple of very nice logical steps in there (if they were even intended and i didn't just invent interesting ways to get around doing basic sudoku...) but the rest was a bit too basic, easy and quick in comparison - almost more of a typing exercise than a puzzle. i found the harder steps very quickly and found it much easier than number 3, but for some solvers it would suddenly grind to a halt if they were breezing through the easy bits and didn't then spot the harder logic as quickly as i did. again, certainly not a bad puzzle, but i think some people would get a little annoyed if they just spent time doing very easy but somewhat time consuming typing in of numbers and then it suddenly got harder halfway through, only to then go back to being very easy after just two small harder and nicer steps. again: personal preference, nothing objectively wrong with it... just maybe something to keep in mind.
Overall, if you want to make puzzles of roughly the difficulty of numbers 3 and 4 here: I would say try to find a style in between those two. Not a constant tedious grind for finding singular pencilmarks leading to pairs/triples, but not a very easy typing exercise interrupted by just one or two harder steps either. I'm finding it hard to put this into words accurately, so maybe don't take it too literally... just pay attention to how the solve path feels: would it be fun to solve for a solver? or is the only reason you're having fun with it just because the idea of setting anything at all is giving you a rush?
Don't be discouraged though! I'm saying this harshly because you wanted it harshly, but I'll say again: well done setting your first few puzzles either way. Yes, sure it could be even better, but even as it is they are not at all bad, certainly for a beginner! I may have just listed everything about them i don't really like... but overall i actually did kinda like solving them. I would say just publish them anyway, together as a set like you did here if you need an excuse to include puzzle number 1
... and see what other solvers think of them and have to say about it. reading comments on your puzzles is the only way to know what people think, after all.
