Her outfit is casual and polished and mixes tones of blue and brown. Coordinate his colors with hers--add some pattern on the shirt and texture on the jacket. There is a great rhythm of tones between the two of them without feeling too 'matchy.'
She goes preppy and bright and so can he. Keep his outfit a bit more tonal (only blue and green used above) to avoid an overly-colorful, juvenile feel.
Her outfit has some edge. His can, too--use black and grey exclusively. The leather jacket is sharp--not too many bells and whistles (in other words, zippers and snaps) allows it to go edge-y or more refined with other combinations.
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