My opinions tend to be different than a lot of people, but I'ma give it anyway. ^_^
Firstly, Seaguard. I honestly cannot warrant using these in an army. You either stick them in ranks to get exta attacks if charged and lose shots per turn, or vice versa. They just don't seem worth it to me in my opinion. I'd rather take a big squad of Spearman to bulk up my lines or just plain Archers. They also only have shorter range than normal Archers, 24" compared to 30". I personally cannot justify taking them in any army.
If you're using your Swordmasters as one solid block, then consider taking a squad or two of 5 Shadow Warriors to skirmish in front of them. At 80 points for 5 I always try to fit at least 2 squads in as I really like them. Or you can use them more aggresively to irritate an enemy my placing them as close as you can at the start. ^_^
Your Mage. Since you've decked him out with Dispel Scrolls, I assume you're using him purely for defensive purposes? In that case, you get no bonuses for making him level 2 other than an extra spell and extra power dice, but if you're up against a magic heavy army you'll get nothing from those 35 points, and would be better spent somewhere else. Drop a Swordmaster and that'll give you enough points for a second Great Eagle. Then use your Swordmasters 7 abreast in 1 squad of fourteen, or two squads of 7 as someone else has said.
People may disagree, but each to their own.
