The feeling on the portrait is quite intense, good job on that
Also, the last one has a clear composition and feel well balanced. The armor is interesting and clearly not generic.
However, on the flower one, i feel the contrast between the foreground character and the background is too strong. The character is really sharp, while the backgroud is really blurry, even near the character. Maybe with some sharper eges on the green area around her would help ?
Oh by the way, i like the colors you use overall