Overall, this thing is looking pretty dope, I noticed that yer lyk le skulls eh? Hehe.
I think that you should try to make some smooth shadows on the skull so it gets a bit of depth.
And fix those roses! They aren't looking good to me,i mean, don't get me wrong, but it looks very repetitive, just try to have those lighter colours fade a bit.
I am sure you can do that
Regardless: great design & concept