well from first glance i would suggest finding some more rocks, those two rock are very similar in size and shape which can be un comforting to the eyes. what i would suggest is go out rock hunting in nature for some nice rocks. if you want to go with two rocks structures like you have in this setup i would suggest making one much bigger than the other. make one rock cluster the focal point of the tank (I say cluster because i always suggest surrounding the main rock with smaller ones like you would see in nature) then position the second rock cluster on the other size so its maybe half the size of your main rock cluster. this kinda makes your once big rock the focal point. however in a tank this size i would consider even jst doing one cluster of rocks on either side of the tank and let the plants do the rest.
what type of substrate is that? my assumption is just gravel. which is fine, you just need to select the correct plants for such an environment. low maintenance plants that do not require a nutrient rich substrate to survive such as anubias, java fern, Lilaeopsis, crypts stuff like that.
i look at this setup and i assume you want a non co2 low tech tank, am i correct? if so do you plan to dose any ferts? i kinda want to know where your coming from and what your goals are on this tank before i give too much advice.