Hello everyone. I just built a simple drawing application using j2me. Basically you can draw using your stylus. During development I found some reference that I think it would be helpful if you plan to work with images on j2me. Here is a link to a jpeg encoder in j2me, quite useful for me to convert an Image to a byte array that can be stored on a jpeg file: http://ce.sharif.edu/~p_amini/j2me/JPEG_Encoder

this other link is a thread on a forum that explains pretty much what you have to do to convert an image to a byte array.
http://forum.java.sun.com/thread.jspa?threadID=5240638

I hope you find these useful.