- looking at driveway, it looks like you have some pot holes already, and looks like the rock been there a few years and compacted were tires normally run down the driveway.
- it looks like there some additional "low spots" were water runs through driveway (on heavy sudden rains)
- no ditches to speak of for driveway.
- you need to deal with snow.
- you need to mow regular lawn
- you need to deal with pasture area
- with your driveway, fence line and trees. not sure how the snow drifts will be. and going to assume. you will have a couple drifts some place in driveway, that will need to be removed. so you can actually get a car up and down the driveway.
- looking at the fence posts, and wire on it. looks like in a couple years or so, fence will need to be put in new posts and wire for it, if you plan to put any sort of animals in it.
- if you get animals to put in the fence area, that may predict a given size tractor, pending on how you feed them (small square bales, to larger round bales)
- if you pull fence out, and just mow what you want, then most likely you will want to re smooth the pasture out to make it less bumpy for mowing.
- looks like some low spot in yard around the home. as in standing water after it rains. and ground being soggy / muddy.
i would say you need a SCUT (sub compact utilty tractor) at min. so you can get a FEL (front end loader), and a 3pt hitch to run attachments on the rear. to deal with driveway, fence, garden.
you will have to simply wait longer after each rain, before you get out on the lawn/grass to mow it. resulting in most likely taking half passes (1/2 width of mower deck) due to grass gotten to tall. and need to make 2 to 3 times running across grass to get it all mowed down. you might find a 3pt hitch finishing mower regular mower, with rear discharge more to your liking. due to less likely leave "wind rows" large row of clump of grass behind you, unlike side discharge finishing mowers.
with a SCUT, the ground clearance is not that much. and you may have issues with a 3pt hitch rear blade, and running through snow drifts, result is you will most likely need to use the FEL to remove snow drifts, and/or get a snow blower.
a CUT (compact utilty tractor) has higher ground clearance and is heavier, and more likely to deal with the snow drifts better and be able to take the driveway in 2 passes vs 2 to 4 times with a SCUT when speaking use of 3pt hitch rear blade.
mowing takes up majorty of the time if using it for both mowing and everything else. i have been tempted a couple times to buy a *meh* forgot the name, finshing mower with engine on it, that you can pull behind another mower or UTV / ATV. to get a wider mowing path. to reduce time spent mowing. 7 acres if you mow the entire pasture as regular lawn. is going to take you good portion of a day. (check oil, get gas, grease machine, mow, take a break, mow some more, fill up with gas, etc...) zero turn mowers, tend to more excel at moving quicker while actually cutting grass vs a riding lawn mower. riding lawn mowers tend to bog down. the smaller cheaper zero turns may have issues with taller grass. (undersized for what you need) double check how high mower deck can be raised, and if it is easy to access the belt and clean the deck both top and bottom. so if you do use regular mower to cut down taller grass / weeds you might be able to get away with it.
if you just cut the pasture a 2 to 4 times a year, a rotatory mower (bush hog) be better choice, and keep the finishing mower belt and blades in better condition. they do sale ATV / UTV pull behind rotatory mowers, but additional engine to take care of. and suggest a 3pt hitch version for a tractor.
to note it. i am not a fan of riding lawn mowers. after mowing for even for a few minutes, when you hope off, your entire body feels like it is still vibrating. zero turns and larger tractors tend to get away from this.