That's a great first attempt. I've seen a hell of a lot worse from people who were supposed to be professionals. As guys have said try a thinner solder, you could nearly weld your car engine to the chassis with the stuff you're using.
Also (this is not healthy so wear a protective mask), a lot of the people who mentored me on the finer points of soldering were heading towards retirement or had passed it by a decade or two, they all loved the cheap chinese solder you can sometimes pick up, basically the stuff which still has a high lead content so do not inhale it. Another point, your tips are probably becoming damaged from leaving them on when your not using them. Only turn them on just before using them and get a set of grips like this:
This way you can hold things in place while you solder. Remember to get a tiny bit of solder on the tip first. Hold the iron in one hand, the solder in the other and slowly introduce both together to the clamped wire or connector. Less is always more when it comes to solder.
To avoid that "robot money shot" finish - twist the bare wire, gently coat it with a TINY amount of solder, then pass it through the connector terminal and wrap it once over the top of the connector. Then add a little solder and iron at the same time to the connector and ensure there are no big blobs, just a smooth silvered finish.
Also pick up one of these:
There are constant arguments between engineers over solder gause/mop and pumps when de-soldering. I prefer pumps, always have, but I have colleagues who sneer at the idea. I prefer pumps because sometimes the quality of gause is not uniform and you can end up buring wires or components when trying to de-solder, but each to their own. To use the pump, simply add a tiny amount of solder to the tip of your iron, introduce the tip to the area you wish to de-solder, when the solder melts, press the button and you're burning rubber.
Finally, I said this earlier, less is always more, you can always add a little more solder to a connection, but having it spill on neighbouring connections and de-soldering it is always more of a pain in the arse than adding more. Also, practice soldering for a day or 2 on some old broken electronic item before attacking your much loved axe. Hope this was helpful and apologies for the chapter.