Hmm, I've some problems with the Rendo site: Some times it's not reachable in the middle of a session or the text of my next post vanished if a have a quote first. 

Okay, related to your last post:  A photo is in a normal case a pixel file and cannot be transfered into a vector file (without big losses). 

The drawing tools are based on vector principles (Bezier Curves), which give you a lot of possibilities for drawing and correction. The only difficulty is the drawing with the mouse. I have bought a grafic tablet (CINTIQ 22HD by wacom) which give me a feeling of direct draw on a piece of paper. 

Henning