First one??? Wow... Well done, if that's the case.. Love the water, and the shore-line looks real enough as well, along with the bullet-splashes... Nice touch. Water's a tough medium to model and you did it first time out.. Also, using the wire from the mortar cans is an excellent use of available materials... Learning how to "see miniature" in everyday objects is something that wil serve you over and over again... Not to mention that it'll save you some coin.. Outstanding..
Few tips for the next one. Don't place the objects in the dio parallel or perpendicular to the base edges. A slight angle, even 10 degrees or so, will give you a much better "snapshot" effect. Also, placing the boat at an angle to shore would help too... Moving on... Don't be afraid to start "Frankensteining" your figures. Using them straight outta the box is ok, but will limit your story possibilities... You'll want, as you gain experience, to make the figures fit your story, rather than make a story to fit the figures...
Bottom line is keep 'em coming. Keep that first one forever and use it to look back at as you grow as a diorama-builder... You're off to a good start...