Yeah, i checked snake anatomy and while it is anatomically corect it kind of looks sorta strange. Guess it's because we're used to mamals carrying their children in the belly area, so carrying them in what appears to be the tail seems strange.
since i've allready started typing i might as well give a full review.
okay, to start off with the bad things. Sorry if i sound picky, but with the quality you give us, one need to be a bit picky. At least if the criticism is supposed to be constructive. I'm going to skip the genital placement and the placement of her uterus, because we've allready talked about that. What kind of seem strange to me is the color of her underwear. For dragonir you've used blue (her real color, unless it's a shiny) as well as blueish purple for her clothing. Then you use purple/red for her underwear, with the colors not repeating anywhere else save for her eyes. With the dominating blue, the sudden change to red stands out and feels almost missplaced. I understand it's supposed to capture the attention of the viewer, but i feel it's maybe a little overdone. Secondly it kinda surprises me how she so simply lifts her swollen abdomen. Wouldn't you want to keep that on the ground when pregnant, both to not harm your offspring and because it would be pretty heavy.
Now for what's good, and there's a lot of it. I got to say i REALLY like her head. It's smooth and makes her look really young, probably late teens. Also the use of yellow eyeshade combined with golden/yellow earlobes really compliment eachother, so even if they stand out a little they also fit. And that gaze... how do you even do that? It looks frigin awesome! If i'd describe it i'd call it a "come here, cutie~" kind of face, the one you'd die to see on your gf/bf. As for the body, i love how you've made her pregnant look subtle, yet on the same time very obvious. The sleek and slender formes makes her look healthy and fit, with the "clothes" complimenting her form. Personally i'm rather indiferent about the clothing you've put on her, but they are well made and seemlessly fits its wearer. The adition of a bellybutton piercing however, i absolutely love. Those things look really good, and you've manged to combine it with a rather naughty outfit without making it seem slutty. An impressive feat indeed. Lastly i'd like to credit you for making the nether regions visible without them being eyecatching like you see in many images. You've managed to spread the attention over her whole body (with a slight focus on her belly), and thus makes it look like nudity is rather normal among the pokemon specie. This further auguments the impression if it being sensual and sexy (especially the subtle tongue use) without looking slutty. She simply looks like a young Dragonair female who knows what she wants, and how to get it while keeping her dignity.
Overal i'd say this image scores 9 out of 10 points. The point loss is for a combination of the color on the panties looking somewhat off, and how she seems to lift her belly in a rather unnatural way.
I hope i've been a fair judge