Pretty sure these are both sketches by Rick Sternbach:
vtg 1980s concept art - Star Trek Next Generation Enterprise specs Greg Jein v8
vtg 1980s concept art - Star Trek Next Generation Enterprise specs Greg Jein v7
The 3/4 angle image of the deflector is a Probert drawing. I can tell at a glance because his linework and lettering is distinct from Sternbach's, and you can see his signature on the drawing on one of the other photos (as here).Yes, the drawing and handwriting style look like Sternbach, but since Jein led the modeling of the 6' and 2' Enterprise-D models for ILM, it would make sense that he had them in his files.
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