Nice! Your picture is a little smaller than it needs to be. You can post a 400 x 600 pixel picture as an attachment. Actually a little bigger. I think we're allowed 200 kb or so.
It took me years to figure out how to photograph a Yorkie. They move so fast and don't sit still; it's really tough.
The best way I've found for a portrait is to set them somewhere where they can't run off. Like a chair. The best place I found was a teetery hammock. They weren't going anywhere. Then you hold a treat or a toy over your head and snap away. Take lots of pictures and be happy with one.
Action shots are actually easier if they like to fetch. Set your camera on its sports setting in good sunlight, no shadows. Toss a ball. Since you know they're going to be running right back to you, you can set up and snap away as they run back.
Good luck! And be sure to post pictures when you get them.
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Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP).
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