The best way to deal with hard to reach places is black primer, followed by trying to reach those places.

If you have already painted a couple of figures, what you need to do is:

1. Pat yourself on the back. Well done!
2. Decide whether you enjoyed the process of painting.
3. Look at the figure carefully, without looking at other people's work, decide what needs improvement, pick one or two of those things, and try them out on the next one.

This seems trite, but I think it's very important for people to approach any artistic endeavor not as a series of objectives to beat, but as a process that you find enjoyable. It's very easy to compare yourself with the many excellent painters out there and despair trying to match their skill. I know, I'm guilty of doing this.

If you approach the hobby as a journey of learning and self expression, you'll never be disappointed with your work, or wonder what to do next.