The tattoo is old work so yeah it looks weak now
Victorian bathrooms often have a lot of space
The dragon is floating on the water itself it was a suggestion from a fellow dsa member
I do have a4/v4 just not many textures

First,I am going to say there is way too much open space in this image. With the size of the image alone,from the top of her head up is nothing but wall (Full screen on my monitor, which is 1280 x 800,that is saying a lot about the amount of space)

Same can be said for the rim of the tub down to the floor.

Second, there is a dragon her eyes could be focusing on if not looking at the viewer.

Also, what am I seeing in the area of her tattoo just below her shoulder? It looks like there is some bad copy and paste going on.

A little post work in the bend of the leg where it meets her stomach could fix the oddity where they meet. Also what is the dragon setting on? The water or the side of the tub or is it supposed to be hovering, at which point it should have wings like it is in flight or something.

I find myself wanting to look more at the dragon, because of its detail, rather than the girl. Seeing the dragon makes me think you could handle the upgrade to the V4/A4 model without any trouble. Have you at least tried experimenting with these models?