hm. i like the way you chose colors. they go together well. allow me a few suggestions.
:: dark backgrounds need light text. always. in the first one, IT demo is dark and hard to see. don't do that. don't have overlapping text unless it is meant to be unreadable. that becomes frustrating.
:: pick a focus point. our eyes love to wander when we look at things, but you want our undivided attention. in the second image, you have two bball players, but you only need us to see one. for the reflection portion, try not to skew as much and let the images touch. let the shadow be set to about 30% opacity or less. definitely no more than 40.
i hope this helps. if you have any questions, i love photoshop, so ask away.