Hey Eros! I merged the topics for you and deleted the post with the broken images so we can keep things neat in one place. :)
The sketches turned out quite well! I looked up the Loomis Method, and it looks very solid. I've never used it myself though, so I'm not sure how much I can offer in terms of advice on that method, but the results so far look promising.
The shading on the baby's face looks a little too sharp to me, turning what should be a soft baby face into an almost old man's face. I get the impression that his head is also too oval, and would look more baby-like if it was more rounded like the original photo.
While sharp eyebrows work out very well for women who wear makeup, I recommend focusing on eyebrows by avoiding outlines. The baby's eyebrows are blond and not very obvious, so drawing them so sharply contrasted on the face doesn't look quite right.
https://cdn3.vox-cdn.com/thumbor/ST3W8A3Kum8HlwddNHoF07WWrhk=/0x0:1920x1080/1600x900/cdn0.vox-cdn.com/uploads/chorus_image/image/46147742/cute-success-kid-1920x1080.0.0.jpg
For higher accuracy, use your pencil to draw 'feathery strokes' to shape the eyebrows, like drawing each hair individually. They'll appear softer and more natural on people who don't use makeup. :)
On the woman's sketch, the only thing that stands out to me is her left eye (our right). I don't think I'm familiar with the original so I can't compare, but it looks to me like the corner of her eye is too squinted compared to the other.
I know this was a lot, but I can tell you put a lot of effort into it and you did well! I hope my critique was useful to you.