For the most part the newsfeed grid looks great with the majority of content being guitar images and videos. There is some content which would be better suited to stories which would give your newsfeed grid a better overall visual appeal.
The photos of guitars with amplifiers behind them look great and fit your newsfeed well. The majority of the videos also look professional, mostly the ones where the camera is on a tripod and not hand-held.
Consider whether each post is professional enough to include in your newsfeed or if it should be posted in your stories. Only your higher-quality photos and videos should be posted in your newsfeed. You can go through and “archive” posts which do not fit this description. This will keep your newsfeed packed with quality content. We can show you how to do this if needed.
Some of your videos could also be made into IGTV content which gives your audience a longer video to watch.
Overall, your content is 80% on the way where it needs to be in our opinion.