For first or new efforts these are good, but you want to know how to progress, to make future bowls look even better.
The natural edged bowl: The great bowl turner, Richard Raffan, Say's of bowl design,
"great grain and patterns will carry a bowl for only a short while, a bowl lives or dies then by it's shape more than any other factor"
this is somewhat paraphrased but does have the principle of his intent, that is, really spend time getting the shape right, because any features will look after themselves after that, they will genuinely enhance the piece rather than be something desperately trying to rescue it.
A more rounded continuous curve with perhaps a small foot looks good on NE bowls, and a particular point to pay attention to is the wall thickness, not that it has to be thin necessarily, but it should be constant at least till you are past the edge, this means you are striving to get a constant width to the edge, now, as the edge is in different places, the tendency as you cut the inside is make the bowl shape and end up, as you have here, with a wider wall at the lower sections, this detracts from the bowls appearance. To avoid that, when you begin to hollow the bowl, decide on a wall thickness, say 7mm not too thin as that can lead to more problems at this stage.
At this stage I usually hollow the bowl out till there is about an inch of material left, this is sufficient to provide support to the wall as you start to cut it thinner.
The begin to cut the waste away from the outer section till you get the wall thickness showing on the highest parts of the edge, looking at the outside of the bowl as it spins to "see" the curve you want to follow.
When you have cut in about an inch. stop the lathe, check the wall thickness, if it is constant, move in a little further and repeat, if it if a little wide you may see a ridge inside to mark the position, otherwise point your gouge at it (but away from the wood some) and start the lathe again, make small cuts till you get the wall even. Follow this step by step all the way the end of the natural edge, then complete the hollowing.
Couple of points: If you make a deeper bit too thin, live with it, trying to go back will be worse and you will end up with a thin uncontrollable wall that chatters and becomes impossible to get right. Hence the need to take it slow, a step at a time.
Don't worry too much about minor ridges, these can be sanded out later.
A scraper can also be used to refine a little, do it it as you move in rather than after to avoid chatter.
This is how I hake natural edges bowls anyway, I am not an expert by any means and others will have differing approaches, but I know what it's like when you want to progress, you are after information. I hope this helps a little.