This is a bit out of my wheelhouse, but I'll do my best!
I'm not to hot for the backgrounds - they're very busy and distract from the simple, pretty nature of the compositions. I would suggest trying the BGs with a flat single color wash, let the watercolor bleed around a bit, and give it a bit more of a Sumi-e effect. I think it would highlight the subject a lot more.
I would also suggest desaturating your paintings a little bit - these remind me a bit of Hallmark card paintings - I'm not entirely sure what you were going for with these, but I think playing the saturation down a little bit would go a long way.
I'll repost in the thread as well. Thanks for posting!
This is a very fine portrait, but a few simple fixes could make it so much better.
There seems to be way too much black in the shading, and it flattens out the side of the face a lot. If you could work in more of the purples used in shading the opposite side, I think it would look much more natural. The black also makes the area where the neck and head meet look very ambiguous. It seems like there is an immediate leap from head to neck, like on a doll. If you did not use a reference, I would definately use one to see that area more in depth.
I think the hair could be worked more in the black area. The idea of the silhouette is nice, but I think that having less pure black would lend to a more natural feel.
Again, I would use reference of some kind if you did not. Some things look like they are off in the face, but then again, I have not seen the source, so who knows.