Refine Brooch STL into Organic Domes

I have an STL of a brooch that a friend kindly drafted for me, however the surface looks far too flat for what I need. I want the piece to feel sculpted, with irregular, organic domes that rise and fall rather than a single shallow curve... (Budget: £20 - £250 GBP, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Rendering, 3ds Max, Blender, CAD/CAM)