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All answers having "Optimistic" as clue:

3 Character Answers:

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RHO

SNY



4 Character Answers:

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ROSY



5 Character Answers:

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LAPUP

NACRE

NICHE

SUNNY



6 Character Answers:

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CHEERY

UPBEAT



7 Character Answers:

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BULLISH

HOPEFUL

ROSEATE



8 Character Answers:

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DEWYEYED

POSITIVE

SANGUINE



9 Character Answers:

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ONBALANCE



10 Character Answers:

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ROSETINTED



11 Character Answers:

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ROSECOLORED