It's a good try, especially image1. Joms is right - head is a bit out of focus. Can be fixed in future by switching face recognition off and setting focus point to image center. Than you will definitely know what you are focusing at.
Images 2 and 3 suffer from hasty composition - better viewpoint could be found, like in image1. Also, for insects/flowers velvia film emulation helps to bring the colors out. Keep practicing - and you will do it better next time!
Everyone can do it - some do it well. But nobody is perfect.