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I presume you experimented with different radii for the Gaussian Blur, so next, why don't you try:

(a) Photoshop's "Lens Blur" filter;

(b) Photoshop's "Diffuse (anisotropic)" applied repeatedly;

(c) some of the new blur filters introduced in CC2014;

(d) download a free trial copy of the plugin, "DoF Pro" by Rosenman;

(e) and finally, get a photographer with a full frame DSLR, about a 100 mm f/2.8 macro, and knows how to light a still life like this to show you what it could look like straight out of the camera.

I assure you that directly comparing many of the common blur / depth-of-field filters with the "real thing" (ie,  an OOF lens) will be very informative.

Tom M