L'Anti Marilyn

The body itself and the outfit looks quite good. Very nice work with the cleavage. The face looks okay and you got the hair right. A little simple for my taste, but why not.
Your biggest problem are the anatomical issues. Ok, i make it quick and painless and i hope you can forgive me. <img src="e.deviantart.net/emoticons/b/b…" width="15" height="15" alt="" title=" (Big Grin)"/>
First the head is compared to the whole body way to small. The lips could need a litte more effort and the nose could be more graceful. (Try thinner strokes. <img src="e.deviantart.net/emoticons/w/w…" width="15" height="15" alt="" title=" (Wink)"/>)
Her right hand is too small and her legs are too big, so the foot either.
You should study a anatomy book. You can exaggerte your babes in a cartoonish way (i do that, too <img src="e.deviantart.net/emoticons/b/b…" width="15" height="15" alt="" title=" (Big Grin)"/>), but there are anatomical rules you should follow them to make it pretty.
The lines on the outfit could be cleaner and you should shade it, too. Looks a littly flat compared to the rest.
I hope this helps.