I also say reduce the bumps... really, unless this is a wreck, rather do NO bumps in the flat areas of the texture... the material "microbumps" of painted metal would be really small even on something as a tank, and a plane actually has a way smoother surface (has to, as the bumps in the surface would increase drag), so just drop it.
I would also look at the specular... too shiny. While a painted civilian plane might have a shiny finish, a military model never has. It would kinda defeat the purpose of the camo. And in this case, it increases the effect of the bumps....
Then for something more subjective... I would use MORE reference images. When I look at your plane, I see you looked at some sci-fi, and maybe at some real planes and vehicles. That is good.
But I see that in the end you ended up with some parts that look rather "unrealistic".... the engines... the weapons in the front. the landing skids.
They are all "okay". I see what they should be , in this sense the fill a purpose. MAYBE they enhance the LOOK of the plane even if being unrealistic (I am not so sure here)...
Still, when your plane should be use more "up close", details like that could stick out too much (also because of the different detail size as explained before). I advise you too look into some theory first, before designing your plane. What I mean:
1. The engines do no look like normal jet-engines. Now, you could say its not a jet engine, its sci-fi tech. Well, it doesn't look very partctical unless its some very weird tech (not streamlined at all). Just for the sake of giving the player something "familiar", if in doubt, go with something realistic, and practical looking.
2. The weapons are not streamlined at all. Both of them. For an example how a gatling cannon has to be integrated into a plane look at an F-14 if you want to go with a fast plane... or the A-10 if you can live with a less streamlined plane.
The rocket launcher (I just guess it is that) has a realistic counterpart, the german Bachem Ba 349 Natter from the last days of WW2... that looked quite similar. After the cap of the launcher was blown off. Because LIKE THAT, no plane could fly at more than maybe 500 km/h..... The Natter had a streamlined cap to get above the plane to be intercepted with speed, and the cap was only blown off shortly before the enemy was engaged.
I am pretty sure you will find more streamlined multiple rocket launchers, and of course, the slower the plane should be, the less such stuff looks out of place. Still, at the moment I do not feel that the weapons look right on your plane... they look like an aftertought tacked unto the plane.
Apart from that, I would maybe distribute the weapons over the plane... having all in the nose looks not very balanced to me from a design perspective.
3. I would rather go with NO landing gear than with the one you sculpted. Really, while it might be good enough for being shown as a small RTS Unit, do you really NEED to sculpt landing gear in this use case? When the unit shown is so small, you could save even more ploygons by just leaving it away.
In general though, a rather good first try. Really, keep it up, and practice. You are on the right tracks