More Neophyte Questions About Storyline

I am creating an e-learning course on crocheting for a class.  I have 2 slides containing photos.  Because of the orientation of the photos, there are white bars along the sides of each photo.  Are these white bars bad or good from a design perspective?  If they're bad, what do I do with them and how do I do it?  This is really only my second day with Storyline, and I really don't know what I'm doing.  I'm not a graphic artist, nor am I a technophile.  I need all the help I can get.

Thanks, Joan

P.S.  I've attached screenshots of the 2 slides.  

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