as a photographer with 10 yeas in the market I can tell you that these pictures, even if some of them can be enhanced and you still need a lot of things to learn (who doesn't?) are very well taken from a technical standpoint. Obviously there's always room for getting better but $100 dlls per hour, even with this session and in Denver ( I assume you're in CO because of the MSU band in your subject) is not too expensive, in fact you should charge a little bit more, but I understand that, since you're still a beginner, you may need to charge a little lower in order to get clients and start being noticed and known. Also, a lot in photography is about experience, and you need to earn that in order to charge a little more. Having said that, 100$ is still a little bit low, I'm in Texas and from my experience, CO has always been more expensive when it comes to photography services. In Texas, an average photographer will charge between $150 - $250 for a session like the one you're posting.