Hello everybody,

these days I'm trying to get pass iStock vector application,
but I've been rejected twice already.
I really need some opinion how to improve my illustrations or to know what I'm doing wrong.
I admit, I'm not professional at vector art, I'm more free hand person.
These are the examples of work I sent last time:
1. http://img29.imageshack.us/img29/8751/t2w5.jpg
2. http://imageshack.us/a/img35/3704/m0at.jpg
3. http://imageshack.us/a/img35/4674/5o1w.jpg

this is the text they send me for all illustrations:
sorry but this artwork is not what we are currently looking for in terms of composition, color usage, use of line and shape, concept, detail and/or file complexity

Thank you very much