Since the “crossover bar” is connecting the neutral bus on the right side to the bus on the left side they are both neutral bars. The one on the left is not a “ground bus bar”.
Thanks for the feedback. We are making adjustments to the image and will repost. We hope that you would be able to provide us some feedback for future electrical images. We are going to remove the crossover bar from single-phase side of the image, The arrow from three-phase ground bar arrow, and add an arrow from the neutral bus label to the three-phase bar. From your bio, it would appear your are an expert in that field. Thanks.
he is…body too short
Yes you can have the image depict a neutral bar on each side (the original image) or remove the crossover bar and depict two separate bars, one for the neutrals and one for the EGC’s (equipment grounding conductors). If you show the EGC as a separate bus it should also show that it is bonded directly to the panel enclosure.
And thank you for the compliment I’m happy to help. For the record I never have and wouldn’t call myself an expert in the field. I’ll say that I may just know a little more than the average Joe electrician. 
I would suggest renaming the current bus bar to ungrounded or hot bus bar.
Updated the image in the OP! Thanks, everyone.
The first panel is more accurately described as a split phase panel. “Split Phase” wording indicates the 120v potential available from each leg to the neutral and clarifies some of the misunderstanding about these panels.
Panels should show a Bonding screw, as this is one of the items to look for depending on panel use (service or sub).
Are you two talking about the same thing? If so, I do not think anyone is listening 
Still needs work. Nomenclature is still wrong and the neutral bar is on isolators instead of bonded to the enclosure.