?Alternative to Gallery in Nexus

[anken32]

 Hi, my N7 ver.4.4.2 has the "Gallery" for my photos.
It works fine except I'm unable to remove/ delete any unwanted pictures.  Have tried all kinds of remedies I found online but nothing seems to work for me.
Now I'm looking for good alternative to Gallery. My problem is probably that it  automatically syncs with my laptop. Can't delete them on my laptop either...
I would actually prefer to add my pictures manually via USB Cable.
Can you recommend an app. for my Android Devices (Nexus7 and Galaxys4)?  Most of all, I'm looking for an app where I can easily delete any images.
Thanks in advance for any suggestions.

[matt]

I have no problem deleting photos in gallery. Long press a pic then tap the trash can icon.

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[Ferrareiii]

I try to read