Colour fill issues

Hi everyone. I just wanted to say a big thank you to everyone who responded to my help request. I followed the advice and got it to work how I needed. Nice to have a supportive group of people helping each other out. As a newbee I really appreciate it. 

Oh and thanks for the tip of the tutorial. That would have made it a whole lot easier from the beginning lol. But as they say, you learn more from your mistakes. Cheers

Press ctrl + Y to see the path in outline mode 

here you can easily check if the path is open or closed.

Ayden,

In addition to what Ton said, I imagine the end Anchor Points of adjacent open paths are not coinciding.

This means that you can get a lot of small straight segments between the parts you have now, and they may be visible when zooming in, or even when looking at the final size, unless you make them coincide and become a single Anchor Point.

For each pair you can select (by ClickDragging across at a slanting angle and make sure only two are selected), then Object>Path>Average (Both), then join.

There is a cunning way to draw (a draft version of) the whole hand in one go/path with curves and (especially inner) corners right from the beginning. Presumably, you have already worked with the Direct Seletion Tool (and maybe other tools) to adjust the shapes.

You have many open paths. If you fill an open path it will fill between the start and end points of the path.

Try selecting two open points at the time with the Direct Selection tool (A) and join them using Object > Path > Join

Repeat until you have a single closed path for the hand.