How to add a picture in my program?

Hi every body,

I write a program which draws the shear and bending moment diagrams of a simple beam on matlab.inputs are loads(couples,forces,constant distributed forces and and linear distributed forces) and outputs are shear diagram and bending moment diagram. I want to add free body diagram of the beam too,but i don't know how can I do it,Can anybody help me to solve this problem?

tnx