Day 1 with my XSi - Cupcakes!

[CTdslr]

I went to NYC on Sunday with my new XSi (that I got on Saturday) and played around with it. This is my first DSLR! Any and all C&C would be appreciated!

Here are some photos from CRUMBS on Broadway & 52nd. Click to see the full sized photos.

#1. Cupcake display. It's been cropped and straightened, and imho, it's a little overexposed in some areas. I tried to fix it in Lightroom, but I'm still learning how to use that program.
ISO 200 ~ 20mm ~ f/4.5 ~ 1/25s


#2. Blackout cupcake. Chocolate cupcake with chocolate ganache, and drizzled with chocolate.
ISO 1600 ~ 28mm ~ f/4.5 ~ 1/40s


#3. Baba Booey Cupcake. I feel like it should be cropped to just the right cupcake, but I kind of like it with both. Baba Booey cupcakes (named after Howard Stern's radio show producer.) "Chocolate cake filled with peanut butter cream cheese. Covered with 1/2 chocolate cream cheese and 1/2 peanut butter cream cheese (frosted like a B&W cookie). Surrounded by mini peanut butter chips.
ISO 1600 ~ 28mm ~ f/4.5 ~ 1/40s


#4. Inside the Baba Booey. I tried to focus on the softness and moistness of the cupcake, but had to remove the noise. It just doesn't look right to me. Any tips on how to fix this photo?
ISO 1600 ~ 28mm ~ f/4.5 ~ 1.25s


Thanks!!

More details on my blog.