How about these reasonings.
Captain Picard was onboard of Enterprise D for 8 years (the TV show's air time was 7). It is "illogical" to assume Captain Picard never gained or lost weight or use Botox for wrinkles (don't think they use Botox in 24th century). On the other hand, we can logically assume Captain Picard spent time during his personal shore leaves consuming 20th century food and engaged with 20th century leisure activities somewhere on the 20th century earth. Therefore, please do not assume he had an ever lasting one and only one look throughout these time frame. I checked my own personal photo album, I changed a lot during the last 7 years. As a man approaches 50 years old, every year he will look different.
Also, there were specific amendments requests from Capt Picard himself which I think was not correct in my opinion. But do take note that according to the findings from my survey at LV ST Con that EVERYONE has their own image of Captain Kirk in their mind. He had weight change almost every 2 episodes during season 2. FYI, this was the reason why there was a wrap around green leisure captain jersey. Therefore, it is logical to assume some will say Picard likeness is spot on while other might say it is not.
In conclusion, developing movies characters, we can have very good judgement with the likeness because the specific actor or actress only spent a few months in that specific look. On the other hand, TV characters will have difficulties to satisfy EVERYONE's judgements on a specific character's likeness because the change of physical form will surely happen through out the series (years but not months).
Side trek to TOS. Most collectors from the 1/6 world said the TOS blue was perfect, but close to most if not ALL die hard Trek fans said the blue was my greatest mistake. Btw, I just did a count. I had 486 emails complained I gave these die hard Trek fans false hope of Set Accurate museum grade TOS uniforms. Well, the good part is, I have both versions. Screen Accurate blue will be displayed in my display case and i use the Set Accurate blue (left over prototypes) for photo shoots because I enjoy the color change phenomenon under different lighting conditions.
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