The first one:
The highlights look extremely unnatural, and exaggerated. The blonde's pose looks awkwardly tall compared to the slouching one-- perhaps that could be fixed by making the image's height longer.
I enjoy the character designs and background-- the sky's colors adore.
The second one:
There are only midtones and highlights used.. it makes it look --off. The light source, as with the other picture, is confusing. Again, I like the character designs and the way the clothing and hair is drawn is detailed and really nice.
The third one:
Artistic. I love it.
For this type of style, the highlights match perfectly with these bold pattern designs. And I love how you meticulously drew the shadows on the body.
The fourth one:
The composition slightly throws me off. The trident and head piece is cut off.
But the design is absolutely stunning and gorgeous. I love it. Extremely creative.
I love the tiled look as the back ground, the motifs and tiny details. I love it. heart
The fifth one:
Haha, it's adorable! Love the composition.
The last one:
Can't wait to see the finished product! Looks great so far! :,)