Here are two sketches I made this summer on a nice dark place in France. I started in astronomy with a 7 cm refractor (Meade ETX-70). My first project was (of course) seeing all the Messiers. I have still one to go (M83)...
It took me one year to realise that it was impossible to see stars in a globular cluster with a 7 cm scope (even M13). I think I looked to much to APOD! The fact that I observe from light polluted areas (my home has a typical NELM of 4,5 mag, a 40 minutes drive take me to a 5,5 mag site) doesn't help much.
Great was my surprice when I looked to M4 in France (much higher in the sky than my hometown). I could see details! At low magnification (x10) M4 looked uniform round. But by higher magnification (x89 and x150) a central bar was visible. It looked like a backbone with different brighter knots.
M13 was also a mighty view. I could detect the globular with the naked eye and averted vision! At x89 and x150 there were individual stars visible at the edge of M13. The globular looked very granulated. At the edge of seeing stars in the globural.
All sketches are made on printing paper with a HB/2 pencil, scanned and inverted. Hope you like them.