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All answers having "Mental picture" as clue:

3 Character Answers:

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EEG



4 Character Answers:

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ACME

DIAL

IDEA



5 Character Answers:

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ASYET

BELLE

IMAGE

RIOJA

ROUGE



6 Character Answers:

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NOTION

SHEIKH



7 Character Answers:

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ILLEGAL

RECEIVE

REELOFF

REPLICA

TUTORED



8 Character Answers:

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ADELAIDE



11 Character Answers:

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MATERIALISE



12 Character Answers:

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CHILDBENEFIT

DISAPPROVEOF