Size-wise your images are fine; a general rule of thumb is to keep them to 800 pixels or less on the longest edge for posting here. As to the images themselves, first off, try to avoid 'posting without editing'. Even the best digital captures require some post-processing work. In the case of the first image, the left side is at least 1/2 stop over-exposed, but since nothing's blown, a bit of work with the burning tool would restore the exposure balance. As well, the image is a little too tall for the subject. I understand that you want give the viewer an idea of the height from which she's jumped, but I think cropping some off the top and a little off the bottom would make for a stronger image by having the main subject (The girl) featured more prominently. With respect to the second, I don't think the treatment is appropriate to the image. I'm a big fan of selective colouration, but in this case because so much of the background is already grey, and the existing colours aren't especially strong, it looks rather insipid. This technique is best used sparingly, and when the colour will be bright and strong against an equally strong mono background.
Keep at it!
Just my $00.02 worth - your milage may vary.
~John
