Hi there... Hope you don't mind comments from an amateur.
For starters, I think that you have a good sense of composition in most of your shots and that's a skill that is not easy to learn. So keep it up! I'm still trying to learn too...
For the blurring of subjects, I'm assuming that it's most of it is actually the subject moving and not you... ;p So maybe you'd like to play around with your ISO to get a slightly shorter Shutter lag. Esp when you're indoors. Maybe ISO 200. Flash photography would help too.
But if it's a bright and sunny day and the shots are still blur, chances are, it's your hand bro... :bsmilie:
Try to learn a little photoshop. Once you find out about Levels, curves and Noise reducing, it'll help...
Yes, for contrast you can use PS to increase contrast. From what I understand a lot of people use Curves to increase it but I'm not exactly the best person to ask for this case because I'm really very new at this too.
Playing with contrast may lead you to a bad color saturation and hue.
For a start, try to check the histogram, and play with the leveling. Sometime the color(or in black and white term, the grey tone) could be due to over or under exposure. Change of leveling will somehow help in maintaining the color hue and saturation.