You'll always be their "little" girl, no matter how old you are or the "adultness" of the responsibilities of your life. That's a given.
On the other hand, if seeing an image of you nude is going to cause your parents so much of a problem that it will affect your relationship, then you have to consider those consequences before posting the images.
Perhaps, though, it's not necessarily a blanket condemnation of your posing nude that your parents have, but rather a concern that you might be exploited, or that your images will be for less than 'artistic' purposes. If that might be the case, allowing Mum and Dad to view some images of you that present your figure in an artistic manner might help. I've even heard of models that brought Mom along (as the escort of the day) to see that it wasn't a full-blown drunken orgy when the model was working without clothing.
In the end, each of us deals with the choices we make in life, and I hope that yours work out well for you (and your family).
By the way - I like the watercolor effect of the first image, but agree that the tight crop of the second photo makes it a stronger image.
Here's Amy, to meet the requirements of this section of the forum.... and, coincidentally, someone who dealt with similar questions.