I would say to maybe re-do the lettering on the flower piece to bring it up to the standard of the other work, it's a nice piece. The heart is good but it mainly looks like you've put the dark and midtones in not many highlights, which gives it a little bit of flatness, particularly in the red areas.

On another note, i've recently spent over £600 on various different rotary machines and my chinese £20 stealth copy is still the best and smoothest for black and grey?!