hi 
fasteddie, yea, they sometimes want lots of attention that nothing else seems to matter. That bassinet is just the curest thing!!! 
   Rubi.. don't think you will make her sit still and then take the shot... nah.. she won't. What I do, I lay totally flat on the ground/grass with the camera, I throw her favorite toy and she gets really excited bitting it and everything.. in one of those I call her and as soon as she looks up I take the shot (put your camera in speed mode at all times). Many pics I take her will come out only her hinds, or an ear, or one leg, cuz she moves so fast that I can only get one part of her body. What I do is develop the roll in a CD then I see them in my computer to develop the good ones. There is store here called "Walmart" that a CD of 35 shots will cost only $3.80. A developed pic from that CD costs .22 cents. I probably get 3 - 4 good shots of all those pics (if I am lucky).  
I want to start taking shots of her making those funny faces, like yawning, sticking her thong out and the like, but those are toughy ones. 
Cosita is also 4 1/2 as well. This training, we just have to keep on doing. There will be times you think she is NOT getting it at all and you are frustrated with all the work.. but one day, she "WANGs" does it!!!!    
The potty training, she had 4 exact days she didn't go inside. This morning I put her in her play pen after taken her out.. I went to take a shower and when i came back she had pee and poo in there. bbbrrrgggg... it happens.. so we have to be patience.  
Regarding the bag.. She was a freak case.. now with a lot of work she is learning to like it in there. I want her to be able to stay in the bag when we go to places she can't be rumming around... and also be able to take her walking.  
The brushing, takes a few. Cosita either gave up or she has just leaned to like it. Her hair is now long enough to pin it.. I got these pin from 
http://www.trixieandpeanut.com/getpage.html?6. I will have a pic attached.. She does not have enough hair for a rubber band yet, but these pins are perfect. She has now learned when I say "settle" she just stays still until I finish putting the pin. I will see if I get a pic wearing one. I bought the pair of pink crystal.  
I buy these products from this web site 
http://mjm-petsilk.com/catalog.htm. The Pet Silk Basic Conditioning Three Piece Set ($19.95). Conditioning, Shampoo and  Rinse plus Leave In Mist. My dog's hair is so silky and hardly has mats. The products can be diluted up to 10 times since they are thick. If you wonder about what type of brush I use, ask me.. I will send you the link. 
Ruby, are you Spanish? My English is a second language. I speak Spanish .. 
anyway.. thought typing some tips on how I got Cosita doing some somethings. I can tell you, she can be a tough cookie too!!.. but a lovely one! 
Yorkies are fun and sooooooooooooooooo cute!!!
-Raiza