Flowers

Hey there, I thought I might try and rustle up that critique for you. Feel free to ignore me though.
Like you said in the description, the flowers are quite spectacular. Furthermore you have a nice contrast going on between the dark and flower backgrounds. A way you could augment this contrast is too actually flip the shading and have the lighting coming from the top left. If you do this, the mc would be shaded where the background is light and illuminated with the background is dark.
Now, looking at your picture as a whole I can only see one consistent difficulty and that's your reliance on lines to separate parts of the body. This is an extremely two edged sword because sometime it does its job a little too well. Your biggest offender is the line designating the back of the skull. It makes the ear look like it's coming straight out of the back of the head when the ear should be coming out of the side. What I might suggest ( if I were prone to suggesting suggestions) is that you erase as much of that lines as possible, starting at the bottom end where it breaks just before meeting the jawline and continuing on to where the top of the lower ear meets the skull.
Alright so our next area of difficulty is the shoulder blade ( that little hump on the back) it strikes me as a little small and once again the line you've used to separate it from the main body is doing its job a little too well. Consider delving a little deeper into the light and shadows of a form, these are the best way to show when a limb or part of the body changes into another.
Whelp, that's all I got for you. I hope this helps.
Fare thee well.