Kagari, just my personal opinion for your 2nd and 4th picture you could crop out the right side of the picture as there is colour intrusion in the background. The white orchid(2nd pic) and the red petals(4th pic) is kind of spoiling the subject.
I like your 1st picture. Though it is supposedly to be an abstract but still you have to have a centre of interest. From your picture I deduce that the rim of the pot (or whatever container/vessel) is what you were focusing at.