Trag,

These are good first attempts.

From the top - it depends on the type of camera you have but to me the exposure here is a little overexposed for the snow. So you need to stop down from 1 - 1.5 AV, Even point and shoot digitals allow you to do this, but you'll need to read the manual for your camera

The twig (Middle shot) - This would be really good if you hadn't got the trunk of the tree crossing it so be careful of what is in the background before you shoot, Take a long look before pressing the button and try lots of different positions to make sure you have the best shot and background. On my monitor the tip of the branch looks in focus but the rest is a little out of focus, so you need to learn how to use the auto focus on subjects like this. If your digital then just shoot a load and use the focus braketing so that you get an idea of the differences.

The best shot is the last the flower buds - The composition here is quite good and again it seems a little soft so using the auto focus may be the issue here. The camera again seems to have exposed for the sky and giving you an almost silhouette of the buds.

Hope some of that helps - just keep shooting and posting and you'll improve very quickly.

Roger