you're really talented, these are awesome!
some constructive crit. on the last one: you've done the shading & shadows awesomely on the hand, you could really bring it to life by doing the same with the rose. think of where the light would be falling & add some darker tones. for instance, the base of the rose head on the stem could be a slightly darker pink right down at the bottom?
i really like them, you've got a cool kinda graphic-y style going on. art's such a great form of distraction & expression. keep going :D x