Jamie's answer and Todd and Friedemann's comments are correct. But I will take things one step further and provide you with some information you should be able to use for your particular application of your equalizer.
What you pictured is the classic "smile" EQ setting and it is a good place to start in most situations and for most music. I start there and often end up there for the Equalizer on my mixer for my band.
But as you have discovered, it might not be the best for all music. And as other's have noted, it might not be the best for all speakers, all rooms, all instrumentation, all sources. The optimal equalization will vary based on so many factors.
But if you start with the smile setting, you can make minor adjustments as needed depending on the circumstances. If certain frequencies are not coming through, you boost those frequencies. For example perhaps the high hat and cymbals are not coming through, you might need to bump up the highest two sliders a tad until you hear them. If the kick drum or bass guitar lacks that thump - you might raise the bass sliders a tad and/or lower the mids.
If you have a muddy sound, you might try making adjustments to accentuate the highs, tinny sound, bring down the highs and possibly bump up the lows, hollow sound, bring down the mids and/or increase the highs and lows.
I don't know what sound source your equalizer is connected to, but if the only variable is the music you play, you might just need to experiment with different settings and adjustments for the songs that don't sound right, and then make a note of the settings for those songs (or take a picture).
With my band, I always start about where you are, but then I adjust for the room we are playing in (or for outdoors if applicable) and I also adjust according to what instruments are accompanying my band that day and if their instrument is feeding into the PA. If I'm miking the bass cabinet, I will have a different EQ setting than if not. Sometimes I might need to boost the mid highs to get a clearer vocal through my microphone.
As others have noted, the purpose of the equalizer is to compensate for all the potential variables in the source of the sound and the listening environment. Or perhaps as you have observed, for the instrumentation and arrangement of various songs that might sound better to you with an adjustment for that certain song.
Other listeners of course, might have a different opinion. Ideally and theoretically, what you want to hear on a recorded song, is as close to hearing the song as it was intended to sound live - as your music playback system can re-create.
If you are playing live (or recording), you want your instrumentation and vocals to blend well in the overall mix so the listener will hear everything and no instrument will drown out the other. Also, with amplified music, you might (depending on genre) want to use the equalizer to compensate for the artifacts in the sound introduced by the PA or Sound System - such that the end result sounds more like an unamplified rendition would sound (particularly true if amplifying acoustic instruments).
If you are the only listener, the most important thing is your personal enjoyment of your music. Having an Equalizer will allow you to customize the sound just to your liking. Good luck.