Honestly, they're awful. Doesn't seem like you put effort in at all. The background is 75% of the design, so make sure the text fits with it. Saying that, practising will only make you better. Good luck.
Colors are way too dark, if i had to choose between those two banner i'd like to choose the first one cause the blue color on the second is just... argh..
Way too dark as said above and background doesn't look good. Keep attempting to make more with our suggestions and post them back to see if you've improved